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The malignant transformation of mature cystic teratomas during pregnancy is a rare occurrence in medical literature. In this case report, we present a remarkable instance of mucinous intestinal adenocarcinoma arising from a mature ovarian cystic teratoma diagnosed during pregnancy. This is among the few reports detailing the effective use of the FOLFOX 6 chemotherapy regimen for treating this type of intestinal cancer. Furthermore, we emphasize the immunohistochemical results that confirm the colorectal histological origin. [ABSTRACT FROM AUTHOR]

Mediastinal mature cystic teratomas are rare benign germ cell tumors that predominantly affect children. Despite their low incidence, they present unique diagnostic and management challenges. Early recognition and appropriate surgical intervention are crucial for optimal outcomes. This case report aims to highlight the importance of prompt diagnosis and management of mediastinal mature cystic teratomas in pediatric patients. We present the case of a 10-year-old female patient who presented with persistent chest pain and dyspnea. Imaging studies, including a chest X-ray and contrast-enhanced chest CT scan, revealed a large, well-circumscribed anterior mediastinal mass with calcifications. The patient underwent a right thoracotomy, resulting in the excision of a 6 × 5 × 5 cm mature cystic teratoma. Histopathological examination confirmed the diagnosis. The patient had an uneventful recovery and was discharged in stable condition. Mediastinal mature cystic teratomas pose diagnostic challenges due to their nonspecific symptoms and heterogeneous imaging characteristics. Differential diagnosis includes other mediastinal masses containing fat and calcifications. Surgical excision is the preferred treatment, although complete removal can be challenging due to adhesions to neighboring structures. Close follow-up is necessary to monitor for recurrence and complications. Mediastinal mature cystic teratomas are rare tumors with variable clinical presentations. Early detection and surgical intervention are crucial for optimal outcomes. These tumors should be included in the list of differential diagnoses for mediastinal masses in pediatric patients. [ABSTRACT FROM AUTHOR]

Over the years, the origin of ovarian Leydig cells has been, and still is, a topic subject to deep debate. Seven years ago, we proposed that this origin resided in intraneural elements that came from a possible reservoir of neural crest cells, a reservoir that may be located in the ganglia of the celiac plexus. We believe we have found the evidence necessary to prove this hypothesis. [ABSTRACT FROM AUTHOR]

Teratomas are the most prevalent type of germ cell tumors and usually display benign characteristics. Mature cystic teratomas consist of a varied mixture of mature tissue types that originate from squamous epithelium and skin adnexal structures. It is most commonly found in female gonads. A mature teratoma located in the abdomen of an adult male patient is exceptionally uncommon. In this case, we report a rare case of intra-abdominal mature cystic teratoma in an adult male.

Malignant transformation (MCT) of ovary is rare complications affecting elderly, squamous cell carcinoma being the most common. The prognosis worsens with extraovarian spread. We present two cases of MCT-derived SCC. Patients exhibited abdominal lump, pain, bowel symptoms, sometimes with weight loss; imaging revealed MCT. Age (51–60), postmenopausal status, large size (>20 cm), bilaterality, and complex ovarian lesions raised suspicion of malignancy. Elevated tumor markers (e.g., cancer antigen-125 and lactate dehydrogenase) were noted in one case. Intraoperative frozen section confirmed malignancy, guiding staging laparotomy. One case was advanced stage on histopathology. Intraoperative frozen section aids optimal staging.

Abstract Background Mature cystic teratomas (MCT) of the ovary are benign ovarian germ cell neoplasms. Malignant transformation is possible but rare and ovarian carcinoid tumors in MCT are among the most extremely rare subtypes. Case presentation We report a case of a 60-year-old Iranian woman suffering from postmenopausal bleeding and hypogastric pain for the last 40 days. An adnexal mass was detected during the physical examination. Ultrasound imaging showed a (55 × 58) mm mass in the left ovary. Total abdominal hysterectomy, bilateral salpingooophorectomy and comprehensive staging surgery were performed for the patient. Intraoperative frozen section of the left ovarian mass was indicative of a malignant tumor. She was diagnosed with a carcinoid tumor with benign mucinous cystadenoma arising on MCT of the ovary, confirmed in the histopathology and immunohistochemistry examination. The tumor was classified as low grade and no chemotherapy cycles were considered. The patient was followed up long-term and no recurrence was observed during 14 months of examinations. Conclusion Ovarian carcinoids arising from MCT are rare neuroendocrine neoplasms, and proper diagnosis of these tumors requires careful histopathology evaluation and appropriate examination. Therefore, it is necessary to consider these tumors as a possible differential diagnosis and evaluate them in individuals (especially postmenopausal women) who have abdominal pain or abnormal bleeding and a palpable mass.

Mature cystic teratoma of the fallopian tube is extremely rare, with fewer than 100 cases reported in the English literature. Clinical symptoms are nonspecific, and the diagnosis is most often made after surgical resection. A preoperative diagnosis has the potential to aid with surgical planning and patient counseling. We present a case of a large completely intratubal mature cystic teratoma in a 40-year-old woman who presented to her primary care provider with the gradual onset of right lower quadrant/pelvic pain. The patient's symptoms prompted evaluation with computed tomography (CT) and ultrasound. Imaging showed a dilated right fallopian tube containing fluid, macroscopic fat, and calcifications, facilitating the preoperative diagnosis of mature cystic teratoma of the fallopian tube. Because of her symptoms, she elected to undergo salpingectomy and the diagnosis was pathologically confirmed. The patient's symptoms resolved following surgery.

Primary ovarian carcinoid (POC) is a very rare subset of ovarian tumors, presenting diagnostic challenges due to its inconclusive radiological imaging. In this case study, we present a 30‐year‐old nulliparous female with subfertility complaints and irregular menstrual cycles, who was initially misdiagnosed with an ovarian cyst. Subsequent comprehensive imaging, including Color Doppler, revealed high vascularity, and prompting suspicion of malignancy. Surgical resection and histopathological evaluation ultimately confirmed the presence of a rare Carcinoid tumor, insular type. This case emphasizes a multidisciplinary approach to the early detection and accurate diagnosis of POCs. [ABSTRACT FROM AUTHOR]

Background: Mature cystic teratomas (MCT) of the ovary are benign ovarian germ cell neoplasms. Malignant transformation is possible but rare and ovarian carcinoid tumors in MCT are among the most extremely rare subtypes. Case presentation: We report a case of a 60-year-old Iranian woman suffering from postmenopausal bleeding and hypogastric pain for the last 40 days. An adnexal mass was detected during the physical examination. Ultrasound imaging showed a (55 × 58) mm mass in the left ovary. Total abdominal hysterectomy, bilateral salpingooophorectomy and comprehensive staging surgery were performed for the patient. Intraoperative frozen section of the left ovarian mass was indicative of a malignant tumor. She was diagnosed with a carcinoid tumor with benign mucinous cystadenoma arising on MCT of the ovary, confirmed in the histopathology and immunohistochemistry examination. The tumor was classified as low grade and no chemotherapy cycles were considered. The patient was followed up long-term and no recurrence was observed during 14 months of examinations. Conclusion: Ovarian carcinoids arising from MCT are rare neuroendocrine neoplasms, and proper diagnosis of these tumors requires careful histopathology evaluation and appropriate examination. Therefore, it is necessary to consider these tumors as a possible differential diagnosis and evaluate them in individuals (especially postmenopausal women) who have abdominal pain or abnormal bleeding and a palpable mass. [ABSTRACT FROM AUTHOR]

Intracranial mature cystic teratomas are benign neoplasms that commonly occur at the midline. Mature cystic teratomas at the cerebellopontine (CP) angle are very rare. They are unique germ cell tumours curable by safe total surgical resection and have good prognosis. This case report documents the clinical, radiological, histological features and operative findings of mature cystic teratoma at CP angle. We present a rare case of a mature cystic teratoma at the CP angle in a 24-year-old woman who presented with brainstem compression and cranial nerve deficits. Brain MRI showed atypical findings like hyperintense areas in both T1 and T2 weighted images, calcification and diffusion restriction in part of the lesion. She underwent near total resection of the tumour via right retrosigmoid approach. Intraoperatively, the lesion was intra-arachnoidal unlike schwannomas and the cyst contained sebum-like material, fibrous areas with calcification which are unusual features of common CP angle tumours. Histopathological examination showed well differentiated mature tissues from all three germinal layers and confirmed the diagnosis of a mature cystic teratoma arising from the right CP angle. Patient had good outcome with neurologic recovery. Mature cystic teratoma is a rare clinical entity and should be considered in patients with CP angle tumours when there are atypical findings in brain MRI imaging. Cysts with sebum-like material, fibrous areas with calcification and poor tumour-arachnoid plane intraoperatively strongly suggest the possibility of mature cystic teratoma. [ABSTRACT FROM AUTHOR]

Objective: Gliomatosis peritonei (GP) is a rare entity characterized by multiple mature glial tissue implants in association with ovarian teratomas in the peritoneum and omentum. To date, only 100 cases have been published. Not much is known about the origin, clinicopathological profile or prognosis of GP. SOX2 and OCT4 are recently recognized markers of embryonic stem cell differentiation. Here, the role of SOX2 and OCT4 in the pathogenesis of 11 cases of GP are reported and clinicopathological factors are described. Material and Methods: This was a retrospective study of six years duration (2017-2022). All the cases of GP were retrieved from archives, the diagnosis was confirmed and clinicopathological factors were noted. Immunohistochemical (IHC) investigation for glial fibrillary acid protein (GFAP) and S100 was noted wherever available. IHC for SOX2 and OCT4 was performed using an avidin-biotin technique. Results: There were 11 cases of GP identified. The median age was 29 years and 1/11 cases had nodal gliomatosis as well. There were eight cases of immature teratoma and three cases of mature cystic teratoma. SOX2 was positive in all foci of GP, while OCT4 was negative. These foci were also positive for GFAP and S100. Conclusion: A possibility of GP should be considered as a differential, clinically and radiologically, in cases of omental nodularity. Adequate sampling at the time of surgery is essential to rule out metastasis or growing teratoma syndrome. SOX2, a stem cell marker inducing neural differentiation, may play a crucial role in the development of GP in association with other transcription factors. [ABSTRACT FROM AUTHOR]

Ovarian mature cystic teratomas comprise tissue derived from all three germ layers and constitute 10–20% of all ovarian neoplasms. Malignant transformation of mature cystic teratomas (MCT) is very rare with an incidence of 0.17–2%. The most frequently reported malignancies include squamous cell carcinoma and adenocarcinoma. Herein, we describe a case of a 56-year-old female who presented with abdominal pain and underwent total abdominal hysterectomy with bilateral oophorectomy and omentectomy for a ruptured dermoid cyst. Histological examination showed nests of pleomorphic cells with prominent nucleoli and melanin pigment in the background of a mature cystic teratoma. These cells showed immunoreactivity for Melan-A and HMB-45, thus confirming the diagnosis of malignant transformation of a mature cystic teratoma to a malignant melanoma. [ABSTRACT FROM AUTHOR]

Abstract Background Mature cystic teratoma of the ovary is classified among the benign ovarian germ cell neoplasms, and its malignant transformation occurs very rarely (in about 2%). As a result of nonspecific signs and symptoms, preoperative diagnosis of theses malignancies is a challenge to clinicians, resulting in delayed diagnosis (in advanced stages) and poor outcomes. Case presentation We report the case of a 43-year-old Iranian woman with progressive distension of the abdomen and hypogastric pain, who was diagnosed with squamous cell carcinoma transformation in a mature cystic teratoma of the ovary confirmed by histopathology examination. Total abdominal hysterectomy, bilateral salpingooophorectomy, and comprehensive staging surgery were performed for the patient, and she was scheduled for chemotherapy after the surgery. She responded well to the treatment and is currently continuing her chemotherapy process. Conclusion There are a great number of reports in the literature regarding mature cystic teratoma of the ovary transformation into malignancy, so these neoplasms must be considered as a possible differential diagnosis and should be evaluated in older individuals with abdominal pain and palpable mass, or those with considerable tumor diameter and raised serum tumor markers.

Introduction: Mature cystic teratoma (MCT) is a common type of ovarian tumors that can, in rare cases, undergo malignant transformation. It has been discovered that MCT patients may experience psychiatric symptoms due to the presence of anti-N-methyl-D-aspartate receptor (NMDAR) antibodies, which is the underlying cause of autoimmune encephalitis. Here, we present the first documented case of a patient with anti-NMDAR encephalitis who also had a morphology of low-grade glioma within MCT. Case Report: A 45-year-old woman presented with seizures, altered consciousness, abnormal NMDAR antibody IgG titers, and abnormal brain MRI findings confirm the diagnosis of anti-NMDAR encephalitis. Physical examination revealed an oval mixed echo mass measuring 54 × 37 mm in the left adnexal area on ultrasound of the uterine appendage. The patient underwent laparoscopic left ovarian and fallopian tube resection. The pathological gross examination revealed a pile of grayish-red cystic and solid fragmented tissue measuring 7 × 6 × 2.2 cm. Histological examination revealed characteristic components of MCT. Furthermore, the solid component of the gross tissue showed proliferative and densely arranged astrocytes with cellular atypia, which were positive for GFAP and Olig-2, negative for IDH1 and EMA. And the Ki67 index was approximately 10%, suggesting the presence of low-grade glioma lesions. The patient was diagnosed with malignant transformation of MCT into a morphology of low-grade glioma, not otherwise specified. After the removal of the ovarian tumor, the patient’s psychiatric symptoms improved. Conclusions: Low-grade glioma within MCT is a rare occurrence, and the presence of this malignant transformation in patients with anti-NMDAR encephalitis is even more uncommon.

Background: Mature cystic teratomas or dermoid cysts of the pancreas complicate surgical approaches because of their anatomical position and ever-growing size. Herein, we report a case of a giant mature cystic teratoma of the pancreas that was successfully resected via complete laparoscopic distal pancreatectomy (LDP). Case presentation: A 39-year-old female patient was referred to our hospital for the evaluation of a pancreatic tumor. Three years of follow-up revealed that the tumor had increased in size to 18 cm, with hyperintense solid components on diffusion-weighted magnetic resonance imaging. Considering the possibility of malignancy, we decided to perform an LDP. The capsule appeared solid enough to withstand the retraction of the endoscopic forceps. Tumor size made it difficult to dissect the dorsal side of the tumor from the caudal to the cranial side. Early transection of the pancreas and additional ports facilitated dissection of the dorsal side of the tumor. We completed the LDP without intraoperative cyst rupture. On pathological examination, the tumor was diagnosed as a mature cystic teratoma originating from the pancreatic tail. The patient was discharged on postoperative day 13 with no complications. Conclusion: LDP may be an option for surgical procedures in patients with large cystic lesions of the pancreatic body or tail. Intraoperative observation of the tumor and surgical refinement are necessary to complete the laparoscopic procedure without tumor rupture. [ABSTRACT FROM AUTHOR]

Background: Colorectal cancer (CRC) is one of the most common cancers worldwide, and screening colonoscopy has led to a decreasing incidence rate. However, the incidence of CRC is increasing among young people, especially adolescents and young adults (AYAs) who are not routinely screened. Although CRC is the fourth most common cancer among AYAs, it is extremely rare. In younger patients, CRC is often diagnosed later, and the proportion of patients with advanced CRC is higher than that in older patients. We herein present a case of poorly differentiated mucinous carcinoma of the ascending colon complicated by bilateral ovarian mature cystic teratomas (MCTs) in an AYA. Case presentation: A 17-year-old female patient presented with a chief complaint of abdominal pain and diarrhea that had persisted for more than 3 years. Colonoscopy revealed circumferential wall thickening of the ascending colon, and colonic biopsy revealed a mucous mass and findings of adenocarcinoma, predominantly signet ring cell carcinoma. Abdominal computed tomography (CT) and pelvic magnetic resonance imaging (MRI) showed bilateral ovarian tumors. Laparoscopic right hemicolectomy and enucleation of bilateral ovarian tumors were performed. Although the ascending colon cancer formed a large mass, there were no signs of peritoneal dissemination or direct invasion to the surrounding organs. Microscopically, the ascending colon was a poorly differentiated mucinous carcinoma with signet ring cell carcinoma and lymph node metastasis (9/42). The ovarian tumors were diagnosed as MCTs without any malignant components. The pathological diagnosis was ascending colon cancer (pT4aN2bM0, pStage IIIC) and bilateral ovarian MCTs. Microsatellite instability (MSI) testing was negative, and there were no gene mutations in either RAS or BRAF. Postoperative adjuvant chemotherapy with oxaliplatin and 5-FU was started. Conclusions: We presented a case of locally advanced ascending colon cancer in a 17-year-old female patient. CRC rarely occurs in AYAs. However, the incidence has gradually increased in recent years. It should be considered as a differential diagnosis for young patients with long-term abdominal symptoms of unknown cause. [ABSTRACT FROM AUTHOR]

Background: Mature cystic teratoma (MCT) comprises 95% of ovarian germ cell tumors with 10-25% incidence in adults. The sequelae include torsion (15%), malignant transformation (1-2%), infection (1%), and rupture (0.3-2%). Spontaneous ruptures of MCT with spillage of sebaceous material into the abdominal cavity are rare due to its thick capsules. Ruptured ovarian teratoma can lead to chemical peritonitis, which is uncommon with diverse presentations. It presents with contralateral abdominal pain due to spillage of its contents into the opposite side of the abdominal cavity following tumor rupture. Case description: This is an unusual presentation of twisted and ruptured ovarian teratoma. A 26-year-old para 1 presented with persistent left lower abdominal pain that radiated to right and sought treatment from various clinics for a week duration. She was referred to a tertiary hospital for ruling out acute appendicitis for right-sided lower abdominal pain where the appendix is located. At first, she presented with sudden onset of moderate-to-severe left iliac fossa (LIF) pain during a bowel opening 5 days ago. Subsequently, the pain radiated to the right iliac fossa (RIF) and worsened on the day of admission. She also had multiple episodes of vomiting and vague suprapubic mass for 1 week. Abdominal examination revealed a palpable cystic suprapubic mass which is about 10 × 8 cm with persistent RIF pain. Ultrasonography showed a solid cystic mass at the LIF measured about 11 × 6 cm and the right ovary was visualized, with normal size uterus and thin endometrial lining. There was significant amount of free fluid, with normal kidneys seen. Ultrasound examination provided an inconclusive diagnosis and an emergency laparotomy was performed for suspicion of a ruptured ovarian cyst with a differential diagnosis of a perforated appendix. There was a twisted and ruptured left ovarian teratoma with a gangrenous base found intraoperatively which contains sebum, hair, and slough at the anterior part of the uterus and thicken omentum. Left-sided salpingo-oophorectomy and omentectomy were done. The peritoneal cavity was washed with copious amounts of warm saline. Conclusion: A ruptured dermoid cyst is one of the gynecological emergencies but is often an overlooked diagnosis. Mature ovarian teratoma consists of well-differentiated germ cell layers derivatives developing as hair, muscle, teeth, or bone. The size of dermoid cysts and torsion with infarction can contribute to their rupture. Correct diagnosis and timely surgical intervention are essential for preventing chemical peritonitis, long-term sequelae, and conserving the reproductive function. [ABSTRACT FROM AUTHOR]

Mature cystic ovarian teratomas (MCT) are the commonest germ cell tumors accounting for about 30-45% of all ovarian neoplasms and 60% of all benign neoplasms arising in the ovary. Only 2% of MCTs undergo malignant transformation. We report a rare case of a 48-year-old woman diagnosed with a primary malignant struma ovarii arising in a dermoid cyst of the ovary. The patient was admitted with the complaint of pelvic pain and a pelvic mass in the lower abdomen on gynecological examination and ultrasonography showed a dermoid cyst of the ovary. Preoperative tumor markers and routine biochemistry were unremarkable. A laparoscopic left-sided salpingo-oophorectomy was done. Histopathology of the tissue showed a malignant struma ovarii and immunohistochemistry (CK-19 levels) similar to the guidelines for primary thyroid gland disease. The patient was subsequently taken up for staging laparotomy with total abdominal hysterectomy with right salpingo-oophorectomy and retroperitoneal pelvic and para-aortic lymphadenectomy and omentectomy. The histopathological report of all staging tissues was normal and surgical staging IA was assigned. Thyroglobulin level was monitored in the postoperative period. She is free of the disease for the last 2 years. [ABSTRACT FROM AUTHOR]

Mature cystic teratomas, commonly known as dermoid cysts, are prevalent benign ovarian tumors that originate from germ cells and mature into diverse tissue types. They are usually asymptomatic but can lead to complications like torsion, rupture, or malignant transformation. Endometriosis is a condition in which endometrial tissue grows outside the uterus and it is commonly associated with pelvic pain and infertility. We report a case of a 27-year-old woman who presented with a history of lower abdominal pain and dysmenorrhea. Initial ultrasonography revealed a complex cyst in the left ovary which, on a later Magnetic Resonance Imaging (MRI) scan, proved to be two distinct cystic lesions within the same ovary. Subsequently, a laparatomy and ovarian resection was done, and histopathologic examination confirmed the coexistence of a mature cystic teratoma and an endometrioma in the left ovary. This case report highlights the unique occurence of these two conditions simultaneously, the challenges of differentiating these coexisting conditions and emphasizes the importance of utilizing multiple imaging modalities to achieve an accurate preoperative diagnosis. [ABSTRACT FROM AUTHOR]

Background: Mature cystic teratoma of the ovary is classified among the benign ovarian germ cell neoplasms, and its malignant transformation occurs very rarely (in about 2%). As a result of nonspecific signs and symptoms, preoperative diagnosis of theses malignancies is a challenge to clinicians, resulting in delayed diagnosis (in advanced stages) and poor outcomes. Case presentation: We report the case of a 43-year-old Iranian woman with progressive distension of the abdomen and hypogastric pain, who was diagnosed with squamous cell carcinoma transformation in a mature cystic teratoma of the ovary confirmed by histopathology examination. Total abdominal hysterectomy, bilateral salpingooophorectomy, and comprehensive staging surgery were performed for the patient, and she was scheduled for chemotherapy after the surgery. She responded well to the treatment and is currently continuing her chemotherapy process. Conclusion: There are a great number of reports in the literature regarding mature cystic teratoma of the ovary transformation into malignancy, so these neoplasms must be considered as a possible differential diagnosis and should be evaluated in older individuals with abdominal pain and palpable mass, or those with considerable tumor diameter and raised serum tumor markers. [ABSTRACT FROM AUTHOR]

Introduction: Mature cystic teratoma is a kind of ovarian germ cell tumour. Malignant transformation in it is uncommon with thyroid cancer being rarely found. Given its rarity and nonspecific symptoms, misdiagnosis and indifference when compared to other ovarian lesions is very common. Case presentation: Herein we report a case of a 58 year old post-menopausal female who presented with a history of abdominal distension and loss of appetite. She was found to have an abdominopelvic mass on examination and a raised CA125 levels for which she underwent an MRI pelvis which was suggestive of an O-RADS 5 lesion for which she underwent a staging laparotomy. The final histopathology and immunohistochemistry were suggestive of papillary thyroid carcinoma arising from a mature ovarian teratoma. After a multidisciplinary tumour board analysis, she was planned to be kept under follow–up with regular serum thyroglobulin monitoring. She has no signs of disease recurrence to date. Discussion: Struma ovarii is one type of monodermal ovarian teratoma in which the tumour contains more than 50 % thyroid tissue. Diagnosis in such cases is difficult due to the lack of typical symptoms. In most of the cases, the diagnosis is incidental. Optimal treatment is still unclear given the rarity of the disease. In a few cases, thyroidectomy was done whereas in a few others it was omitted. Further therapy may include radioiodine treatment if needed. Conclusion: To the best of our knowledge there is very scant information available on the natural history, prognosis and management of papillary thyroid carcinoma arising from mature cystic teratoma ovary. Hence, a multidisciplinary treatment approach may be needed for the same.

A 25‐year‐old female Carney complex patient with a PRKAR1A mutation who had undergone surgery to remove teratomas visited our dermatology department. She was suspected of having a malignant melanoma in a teratoma. On clinical examination, a black nodule was found within the cyst. On histopathological examination, the black lesion was composed of heavily pigmented round cells with vesicular nuclei and single prominent nucleoli. Additionally, there were large cells with irregularly shaped nuclei. Upon immunohistochemical examination, the large, irregularly shaped cells were positively stained with Melan A, HMB45, S‐100 protein, SOX10, CD10 (focally), and BRAFV600E, but negatively stained with PRAME. Based on the histopathological features, we diagnosed the patient with pigmented epithelioid melanocytoma (PEM) in a teratoma of a Carney complex patient. This is the first case of PEM developing from a teratoma. Since PEM lesions may spread to regional lymph nodes, careful follow‐up is necessary. [ABSTRACT FROM AUTHOR]

Introduction: Mature cystic teratoma (MCT) is a common type of ovarian tumors that can, in rare cases, undergo malignant transformation. It has been discovered that MCT patients may experience psychiatric symptoms due to the presence of anti-N-methyl-D-aspartate receptor (NMDAR) antibodies, which is the underlying cause of autoimmune encephalitis. Here, we present the first documented case of a patient with anti-NMDAR encephalitis who also had a morphology of low-grade glioma within MCT. Case Report: A 45-year-old woman presented with seizures, altered consciousness, abnormal NMDAR antibody IgG titers, and abnormal brain MRI findings confirm the diagnosis of anti-NMDAR encephalitis. Physical examination revealed an oval mixed echo mass measuring 54 × 37 mm in the left adnexal area on ultrasound of the uterine appendage. The patient underwent laparoscopic left ovarian and fallopian tube resection. The pathological gross examination revealed a pile of grayish-red cystic and solid fragmented tissue measuring 7 × 6 × 2.2 cm. Histological examination revealed characteristic components of MCT. Furthermore, the solid component of the gross tissue showed proliferative and densely arranged astrocytes with cellular atypia, which were positive for GFAP and Olig-2, negative for IDH1 and EMA. And the Ki67 index was approximately 10%, suggesting the presence of low-grade glioma lesions. The patient was diagnosed with malignant transformation of MCT into a morphology of low-grade glioma, not otherwise specified. After the removal of the ovarian tumor, the patient's psychiatric symptoms improved. Conclusions: Low-grade glioma within MCT is a rare occurrence, and the presence of this malignant transformation in patients with anti-NMDAR encephalitis is even more uncommon. [ABSTRACT FROM AUTHOR]

Mature cystic teratomas also known as dermoid cyst are one of the most common benign tumors of the ovary. It is usually seen in young women in the reproductive age group. It comprises of mature elements derived from all the three germ layers. In this case series we reported a series of 4 cases of mature cystic teratoma of the ovary with uncommon clinicopathological presentations. First case was a rare entity of melanocytic nevus arising from a mature cystic teratoma. Second case was adipocyte rich teratoma, an uncommon lipomatous lesion of the ovary. Third case was rupture of dermoid cyst presenting as acute abdomen. Fourth case was mature cystic teratoma in a post-menopausal woman. To conclude, though dermoid cysts after surgical removal have an uneventful clinical course, extensive sampling of the specimen for histopathological study should be done to identify rare pathologies which bears a clinical significance. [ABSTRACT FROM AUTHOR]

This retrospective study was conducted in 27 patients with malignant transformation of mature cystic teratoma（MT-MCT）and 125 ovarian teratoma patients with torsion who underwent surgery in the First Affiliated Hospital of Wenzhou Medical University from 2008 to 2019. The incidence of MT-MCT in this study was 0.79%. The 3-year overall survival (OS) rate was 69.6 ± 9.6%. The 3-year progression-free survival (PFS) rate was 58.3 ± 9.6%. Kaplan–Meier survival analysis indicated that patients with squamous cell carcinoma (SCC) had significantly shorter OS compared with non-SCC patients. Older age (OR 1.076, 95% CI 1.041–1.111), higher platelet (PLT) level (OR 1.012, 95% CI 1.005–1.020) and lower neutrophil-to-lymphocyte ratio (NLR) level (OR 0.794, 95% CI 0.647–0.915) were independent predictors of MT-MCT. The area under the curve (AUC) for the combined use of age, PLT count and NLR was 0.921 (95% confidence interval 0.877–0.964; p < 0.001), with a sensitivity of 92.6% and a specificity of 80.8%. [ABSTRACT FROM AUTHOR]

While mature cystic teratomas are relatively common ovarian neoplasms typically comprising of multiple embryologic cell types, a specific monodermal subtype involving thyroid tissue, struma ovarii, can rarely be seen. This case reviews typical imaging characteristics with MRI and ultrasound of struma ovarii and details possible complications from these masses with intraoperative and histologic correlation.

The synchronous occurrence of bilateral ovarian tumors and breast malignancy often raise the suspicion of a Krukenberg tumor or a hereditary breast and ovarian cancer syndrome, both of which are uncommon in clinical practice. A 58-years-old postmenopausal woman had a right breast lump and was diagnosed as infiltrating duct carcinoma, no special type, and incidentally detected bilateral adnexal mass with the clinical suspicion of Krukenberg tumor. However, following the radical surgical excision of the right breast and bilateral ovaries, the right breast showed invasive micropapillary carcinoma (IMPC) while the ovaries showed mature cystic teratoma (MCT) with benign Brenner tumor. IMPC of the breast along with bilateral ovarian MCT with benign Brenner tumor is an unusual clinical occurrence in a postmenopausal female and thus worthy of documentation. It should be categorized as a non-hereditary synchronous tumor. The histomorphology augmented by immunohistochemistry and appropriate clinical context is pivotal in rendering a correct diagnosis.

Introduction: Ovarian masses are not uncommon in pregnancy. The increased use of Ultrasonography (USG) in recent years has led to the detection of asymptomatic ovarian masses in pregnant women. Dermoid cysts are the most common type of ovarian germ cell tumour in pregnancy. Most of them are asymptomatic and are incidental findings. However, a few can present with complications such as torsion and rupture. The diagnosis and management of dermoid cysts in pregnancy present a clinical dilemma. Aim: To evaluate the management and outcomes of antenatal patients diagnosed with dermoid cysts. Materials and Methods: A retrospective observational study was conducted in the Department of Obstetrics and Gynaecology at Christian Medical College, Vellore, Tamil Nadu, India, from January 2015 to January 2022. The study included 37 patients, and data regarding the diagnosis of dermoid cysts, their radiological and clinical characteristics, management, and pregnancy outcomes were collected from the electronic database. Descriptive statistics were used for reporting demographic and clinical characteristics. Categorical variables were presented as numbers with percentages, while continuous variables were presented as mean with Standard Deviation (SD) or median with Interquartile Range (IQR). Results: The dermoid cysts ranged in size from 2.2 cm to 30 cm, with a mean size of 7.28±4.51 cm. A total of 35 (95%) of them were incidentally detected. USG was the imaging modality used for diagnosis and follow-up. Only 30% (11/37) of the patients required surgical intervention during the antenatal period. Torsion was the indication for emergency surgical intervention in 46% (5/11) of cases. Laparoscopy was the preferred approach for surgical intervention in 91% (10/11) of patients. The remaining 70% (26/37) of patients were managed conservatively with serial USG, and no adverse outcomes were reported. Among the patients who underwent caesarean section for obstetric indications, 35% (13/37) also underwent surgical intervention for the dermoid cyst (either cystectomy or oophorectomy) during the same procedure. Conclusion: Antenatal patients diagnosed with dermoid cysts during pregnancy can be managed conservatively with serial USG, with a plan for surgical intervention if needed. In cases where surgical intervention is required, it can be safely performed as a laparoscopic procedure. In case of complications such as torsion, laparoscopy can be performed during pregnancy with appropriate precautionary measures.

This retrospective study was conducted in 27 patients with malignant transformation of mature cystic teratoma（MT-MCT）and 125 ovarian teratoma patients with torsion who underwent surgery in the First Affiliated Hospital of Wenzhou Medical University from 2008 to 2019. The incidence of MT-MCT in this study was 0.79%. The 3-year overall survival (OS) rate was 69.6 ± 9.6%. The 3-year progression-free survival (PFS) rate was 58.3 ± 9.6%. Kaplan–Meier survival analysis indicated that patients with squamous cell carcinoma (SCC) had significantly shorter OS compared with non-SCC patients. Older age (OR 1.076, 95% CI 1.041–1.111), higher platelet (PLT) level (OR 1.012, 95% CI 1.005–1.020) and lower neutrophil-to-lymphocyte ratio (NLR) level (OR 0.794, 95% CI 0.647–0.915) were independent predictors of MT-MCT. The area under the curve (AUC) for the combined use of age, PLT count and NLR was 0.921 (95% confidence interval 0.877–0.964; p

Introduction: Ovarian masses are not uncommon in pregnancy. The increased use of Ultrasonography (USG) in recent years has led to the detection of asymptomatic ovarian masses in pregnant women. Dermoid cysts are the most common type of ovarian germ cell tumour in pregnancy. Most of them are asymptomatic and are incidental findings. However, a few can present with complications such as torsion and rupture. The diagnosis and management of dermoid cysts in pregnancy present a clinical dilemma. Aim: To evaluate the management and outcomes of antenatal patients diagnosed with dermoid cysts. Materials and Methods: A retrospective observational study was conducted in the Department of Obstetrics and Gynaecology at Christian Medical College, Vellore, Tamil Nadu, India, from January 2015 to January 2022. The study included 37 patients, and data regarding the diagnosis of dermoid cysts, their radiological and clinical characteristics, management, and pregnancy outcomes were collected from the electronic database. Descriptive statistics were used for reporting demographic and clinical characteristics. Categorical variables were presented as numbers with percentages, while continuous variables were presented as mean with Standard Deviation (SD) or median with Interquartile Range (IQR). Results: The dermoid cysts ranged in size from 2.2 cm to 30 cm, with a mean size of 7.28±4.51 cm. A total of 35 (95%) of them were incidentally detected. USG was the imaging modality used for diagnosis and follow-up. Only 30% (11/37) of the patients required surgical intervention during the antenatal period. Torsion was the indication for emergency surgical intervention in 46% (5/11) of cases. Laparoscopy was the preferred approach for surgical intervention in 91% (10/11) of patients. The remaining 70% (26/37) of patients were managed conservatively with serial USG, and no adverse outcomes were reported. Among the patients who underwent caesarean section for obstetric indications, 35% (13/37) also underwent surgical intervention for the dermoid cyst (either cystectomy or oophorectomy) during the same procedure. Conclusion: Antenatal patients diagnosed with dermoid cysts during pregnancy can be managed conservatively with serial USG, with a plan for surgical intervention if needed. In cases where surgical intervention is required, it can be safely performed as a laparoscopic procedure. In case of complications such as torsion, laparoscopy can be performed during pregnancy with appropriate precautionary measures. [ABSTRACT FROM AUTHOR]

Featured Application: Ultrasound scores should consider that some frequent masses such as fibromas, cystoadenofibromas, some mucinous cystadenomas and Brenner tumors may present some characteristics that induce confusion with malignant lesions. Some malignant lesions are not always identified as malignant. Background: Ultrasound features help to differentiate benign from malignant masses, and some of them are included in the ultrasound (US) scores. The main aim of this work is to describe the ultrasound features of certain adnexal masses of difficult classification and to analyse them according to the most frequently used US scores. Methods: Retrospective studies of adnexal lesions are difficult to classify by US scores in women undergoing surgery. Ultrasound characteristics were analysed, and masses were classified according to the Subjective Assessment of the ultrasonographer (SA) and other US scores (IOTA Simple Rules Risk Assessment-SRRA, ADNEX model with and without CA125 and O-RADS). Results: A total of 133 adnexal masses were studied (benign: 66.2%, n:88; malignant: 33.8%, n:45) in a sample of women with mean age 56.5 ± 7.8 years. Malignant lesions were identified by SA in all cases. Borderline ovarian tumors (n:13) were not always detected by some US scores (SRRA: 76.9%, ADNEX model without and with CA125: 76.9% and 84.6%) nor were serous carcinoma (n:19) (SRRA: 89.5%), clear cell carcinoma (n:9) (SRRA: 66.7%) or endometrioid carcinoma (n:4) (ADNEX model without CA125: 75.0%). While most teratomas and serous cystadenomas have been correctly differentiated, other benign lesions were misclassified because of the presence of solid areas or papillae. Fibromas (n:13) were better identified by SA (23.1% malignancy), but worse with the other US scores (SRRA: 69.2%, ADNEX model without and with CA125: 84.6% and 69.2%, O-RADS: 53.8%). Cystoadenofibromas (n:10) were difficult to distinguish from malignant masses via all scores except SRRA (SA: 70.0%, SRRA: 20.0%, ADNEX model without and with CA125: 60.0% and 50.0%, O-RADS: 90.0%). Mucinous cystadenomas (n:12) were misdiagnosed as malignant in more than 15% of the cases in all US scores (SA: 33.3%, SRRA: 16.7%, ADNEX model without and with CA125: 16.7% and 16.7%, O-RADS:41.7%). Brenner tumors are also difficult to classify using all scores. Conclusion: Some malignant masses (borderline ovarian tumors, serous carcinoma, clear cell carcinoma, endometrioid carcinomas) are not always detected by US scores. Fibromas, cystoadenofibromas, some mucinous cystadenomas and Brenner tumors may present solid components/papillae that may induce confusion with malignant lesions. Most teratomas and serous cystadenomas are usually correctly classified. [ABSTRACT FROM AUTHOR]

Key Clinical Message: Extragonadal parasitic dermoid cysts are rare. Diagnosis of such extragonadal parasitic teratoma is often done intraoperatively during surgical exploration of abdominal mass. [ABSTRACT FROM AUTHOR]

Primary ovarian neuroendocrine carcinoid tumors are extremely rare. However, their clinical course is good, and hence, fertility-sparing surgery is a feasible treatment option in cases of unilateral localized lesions. In this report, we present the case of a 20-year-old nulliparous woman who was diagnosed as having a primary ovarian neuroendocrine carcinoid tumor arising from a mature cystic teratoma. She underwent laparoscopic right ovarian cystectomy, and her postoperative recovery was uneventful. The patient has been under close observation over a 1-year follow-up period and has shown no evidence of tumor recurrence.

Teratomas are tumours developed from germ cell layers, containing derivatives from all three germ cell layers. Mature cystic teratomas are the most common germ cell neoplasms and contain mature elements derived from germ layers. Many previous reports show presence of retinal structures in teratomas. Here we have reported a rare case of mature teratoma of ovary containing corneal, conjunctival, and lenticular structure. A 38-year-old female presented with a 6cm×4cm×3cm echogenic mass involving left ovary. Histopathological examination of the cystectomy specimen showed presence of all three germ cell layer derivatives along with corneal epithelium with prominent goblet cells, conjunctival epithelium, and lenticular structure. The presence of ocular structure in an ovarian mature cystic teratoma is an extremely rare event. [ABSTRACT FROM AUTHOR]

Key Clinical Message Extragonadal parasitic dermoid cysts are rare. Diagnosis of such extragonadal parasitic teratoma is often done intraoperatively during surgical exploration of abdominal mass.

Background: Struma peritonei is an extremely rare presentation of struma ovarii. Case: Here we report the case of a 38-year-old woman with a history of papillary thyroid cancer, left ovary struma ovarii, ruptured mature cystic teratoma of the right ovary, and endometriosis presenting with pelvic pain, dysmenorrhea, abnormal uterine bleeding, and infertility. A diagnostic laparoscopy was performed to evaluate for recurrence of endometriosis. However, multiple abnormal appearing lesions were found on her left hemidiaphragm and left abdominal wall. The tissue was identified as ectopic thyroid tissue identical to the patients ruptured mature cystic teratoma which occurred 15 years prior. A second subsequent laparoscopy was performed to excise the lesions. Eleven additional lesions were identified as ectopic thyroid tissue. This peritoneal dissemination was likely a result of tissue seeding post-mature teratoma rupture. Conclusion: Gynecologists should consider the possibility of struma peritonei in patients who have a history of papillary thyroid cancer and struma ovarii who present with significant pelvic pain and abnormal uterine bleeding. [ABSTRACT FROM AUTHOR]

We aimed to evaluate the incidental risk of malignancy in mature cystic teratomas (MCT) and check the management. We retrospectively reviewed records of patients diagnosed and treated with MCT and divided patients into two groups as pure MCT and malignant transformation of MCT. In our clinic incidence of incidental malignant transformation of ovarian MCTs was 2.7%. Median age (p = 0.005) and mass size (p = 0.027) were statistically higher in malignant group. The most common histological type of malignant transformations was malignant struma ovarii (35.7%). In malignant group, five-year disease-free survival was 66.7% and five-year overall survival was 86.7%. Although the risk of malignancy in mature cystic teratomas is rare, it should not be ignored. Age, mass size, and preoperative imaging should all be evaluated with suspicion and if available, frozen section should be used. Management is inconsistent as a result of its rarity. New management practices should be developed with further studies. [ABSTRACT FROM AUTHOR]

Yaru Sheng,1 Jiangjing Yuan,1 Jing Wang,1 Liya Wang,1 Yuhong Li,1 Yudong Wang1– 3 1Department of Gynecologic Oncology, International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People’s Republic of China; 2Shanghai Municipal Key Clinical Specialty, Female Tumor Reproductive Specialty, Shanghai, People’s Republic of China; 3Shanghai Key Laboratory of Embryo Original Disease, Shanghai, People’s Republic of ChinaCorrespondence: Yudong Wang; Yuhong Li, Department of Gynecologic Oncology, International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, 910 Hengshan Road, Shanghai, People’s Republic of China, Tel +86-21-64070434-18602 ; +86-21-64070434-25517, Email wangyudong@shsmu.edu.cn; 13022107898@163.comBackground: Ovarian mature cystic teratomas (MCTs) are the most common tumors in pregnant women. The premature rupture of membranes (PROM) is a typical complication of pregnancy; however, the relationship between MCT and PROM is unknown. Therefore, we aimed to determine whether MCT is associated with the occurrence of PROM during pregnancy.Methods: The data of patients with adnexal masses during pregnancy between January 2017 and August 2021 were retrospectively analyzed. Ovarian cystectomy was performed during cesarean delivery or after vaginal delivery. Univariate and multivariate logistic regression models were used for statistical analysis.Results: A total of 234 patients with histopathological results were included. Among these patients, 21 occurred PROM during pregnancy, of which 11 were diagnosed with MCT. Compared with other subtypes, MCT (p=0.025) showed a stronger correlation with PROM and was an independent risk factor for PROM (odds ratio [OR], 2.811; 95% confidence interval [CI], 1.096– 7.215; p=0.032). Furthermore, we found that MCT with a diameter > 5 cm (p=0.0037) was more likely to promote the development of PROM than those that with a diameter < 5 cm.Conclusion: MCT was an independent risk factor for PROM during pregnancy. Positive actions and preventative clinical treatments should be fully taken into consideration by clinicians for pregnant women with MCTs, especially those ≥ 5 cm in diameter, to reduce the clinical complications related to MCT-associated PROM.Keywords: benign ovarian tumor, mature cystic teratoma, premature rupture of membranes, pregnancy

We report the case of a 2.5-year-old child admitted for abdominal distension, whose imaging revealed a large posterior mediastinal cystic mass, with a tissue component, a calcification, and a minimal fat component. The ultrasound- guided biopsy led to the diagnosis of a benign extragonadal germ cell tumor, also called mature teratoma or dermoid cyst, whose mediastinal localization is rare, often localized in the anterior mediastinum, and rarely in the posterior mediastinum. The mainstay of treatment is complete surgical excision.

Although the gross and microscopic features of squamous cell carcinoma arising from ovarian mature cystic teratoma (MCT‐SCC) vary from case to case, the spatial spreading of genomic alterations within the tumor remains unclear. To clarify the spatial genomic diversity in MCT‐SCCs, we performed whole‐exome sequencing by collecting 16 samples from histologically different parts of two MCT‐SCCs. Both cases showed histological diversity within the tumors (case 1: nonkeratinizing and keratinizing SCC and case 2: nonkeratinizing SCC and anaplastic carcinoma) and had different somatic mutation profiles by histological findings. Mutation signature analysis revealed a significantly enriched apolipoprotein B mRNA editing enzyme catalytic subunit (APOBEC) signature at all sites. Intriguingly, the spread of genomic alterations within the tumor and the clonal evolution patterns from nonmalignant epithelium to cancer sites differed between cases. TP53 mutation and copy number alterations were widespread at all sites, including the nonmalignant epithelium, in case 1. Keratinizing and nonkeratinizing SCCs were differentiated by the occurrence of unique somatic mutations from a common ancestral clone. In contrast, the nonmalignant epithelium showed almost no somatic mutations in case 2. TP53 mutation and the copy number alteration similarities were observed only in nonkeratinizing SCC samples. Nonkeratinizing SCC and anaplastic carcinoma shared almost no somatic mutations, suggesting that each locally and independently arose in the MCT. We demonstrated that two MCT‐SCCs with different histologic findings were highly heterogeneous tumors with clearly different clones associated with APOBEC‐mediated mutagenesis, suggesting the importance of evaluating intratumor histological and genetic heterogeneity among multiple sites of MCT‐SCC. [ABSTRACT FROM AUTHOR]