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Choroidal osteoma is a rare, benign, osseous choristoma presenting as an orange-yellow, well-defined fundus mass. It presents unilaterally in most cases, has a predilection for the female sex, and favor a juxtapapillary location, becoming clinically manifest when it involves the macula. Almost 60% of eyes with osteoma may suffer significant visual loss. Choroidal osteomas can easily be mistaken for other conditions with similar presentations. We herein report two rare cases presentation of choroidal osteoma: a 74-year-old male with 2-year blurred vision in the right eye (RE) initially misdiagnosed with age-related macular degeneration received intravitreal injections and after a multimodal evaluation, following cataract surgery in RE, confirmed to be choroidal osteoma and a 19-year-old female with a history of choroidal hemangioma presented with blurred vision in her left eye (LE), with examination revealed an irregular orange-yellow lesion along the superotemporal arcade with serous macular detachment, later diagnosed as choroidal osteoma. [ABSTRACT FROM AUTHOR]

Abstract Background An ocular osseous choristoma is a growth of mature, compact bone in the ocular or periocular soft tissue, and it is the rarest form of ocular choristoma, accounting for only 1.7% of all epibulbar choristomas. Case presentation Herein we present the case of a 20-month-old girl who was referred to the oculoplasty clinic with a progressively growing mass in the left lateral canthus. It had been present since birth without ocular involvement. Upon examination the mass was firm with a smooth surface, measured 9 × 6 × 3 mm, and exhibited no episcleral attachment or ocular involvement. An excisional biopsy was performed, and the histopathological findings were consistent with osseous choristoma of the left lateral canthus. Conclusions This report highlights the importance of considering osseous choristoma in the differential diagnosis of eyelid lesions, particularly those that have been present since birth. It also emphasizes the need for further studies investigating associations between osseous choristomas and ocular canthi.

Epidermal nevus syndrome is a rare congenital disorder affecting only a few hundred people in the world. It has ophthalmic, dermatological, and neurological manifestations, with varied presentation. Here, we report a case of two-year-old child who presented with epibulbar mass in left eye, pigmented nevi over left side of the body and alopecia over left side of parieto-temporal scalp. Imaging confirmed epibulbar mass and presence of calcification of choroid on ipsilateral side with presence of arachnoid cyst of brain with underlying pachygyria. Neurological examination was normal and dermatologist confirmed presence of verrucous nevi over skin. Excisional biopsy of epibulbar mass revealed a complex choristoma with presence of lacrimal gland tissue. Underlying ocular findings were near normal with normal posterior segment. It is a rare form of epidermal nevus syndrome with near normal ocular findings in the presence of anterior and posterior choristoma, which has not been reported. [ABSTRACT FROM AUTHOR]

Tessier no. 7 clefts are characterized by macrostomia, facial muscular diastasis and maxillary and zygomatic bone abnormalities. It is caused by a lack of ectomesenchyme formation or penetration of the maxillary and mandibular processes during the fourth and fifth weeks of development. A case of bilateral transverse facial cleft with an accessory maxilla and an osseous choristoma is presented. The diagnosis of accessory maxilla was based on clinical findings due to the inaccessibility of orthopantomography and computed tomography scan. Orbicularis oris muscle reconstruction, cheiloplasty and excision of accessory maxilla were done. Histopathological examination of the bony lesion showed an osseous choristoma. There were no postoperative complications or local recurrence of the lesion excised. This case report demonstrates the importance of early diagnosis and intervention in maxillofacial congenital anomalies. Cheiloplasty restores function and gives the patient a natural appearance. The excision of accessory bone prevents further complications in the child's growth. [ABSTRACT FROM AUTHOR]

We report a case of a 40-year-old Japanese woman with a benign tongue tumor diagnosed as osseous choristoma of the tongue. Resection of the tongue tumor was performed under general anesthesia. The gross examination of the resected specimen showed a bone-like mass measuring 5 × 5 × 3 mm, surrounded by soft tissue. Based on the findings, a histopathological diagnosis of osseous choristoma was established. There was no evidence of tumor recurrence or distant metastasis during the 3-year follow-up. [ABSTRACT FROM AUTHOR]

Choristomas are proliferative growths that occur when normal tissue develops in abnormal locations and may resemble tumors. Oral choristomas commonly present as slow-growing, indolent, and firm masses. The diagnosis primarily relies on histopathologic examination. Given their tumor-like growth and developmental pathogenesis, it is critical to differentiate them from neoplasms. In this article, we present two clinical cases of oral choristomas, a cartilaginous choristoma, and an osseous choristoma of the tongue. We also offer a brief review of the literature discussing clinical presentation, microscopic features, and therapeutic options., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Masson SAS. All rights reserved.)

Osteomas are rare benign bony tumors located in the tongue area. In most cases, patients presenting with a lingual osteoma are asymptomatic but may complain of the sensation of having a foreign body. Fewer than 100 cases of lingual osteoma have been reported worldwide. Here, we present 2 cases of tongue base osteoma that were treated with excision under a laryngoscope. [ABSTRACT FROM AUTHOR]

Osseous choristoma is a tumor-like growth of lamellar bone which is found in a location where the bone does not normally form. It rarely occurs in the mandibular buccal vestibule. These lesions are either developmental (arising from ectopic mesenchymal cells) or a consequence of trauma and chronic irritation. A 50-year-old male was presented for diagnostic evaluation and surgical management of a long-standing hard mass involving the buccal vestibular sulcus of the mandible. The lesion was clinically examined and radiographically investigated using panoramic, intraoral, and cone-beam computed tomography images. Surgical excision was considered the ideal treatment, and postoperative histopathological examination confirmed a diagnosis of osseous choristoma. There was no evidence of recurrence over a 2-year follow-up period. Osseous choristoma involving the mandibular buccal vestibule can be misdiagnosed as an osteoma because of its clinical presentation; however, the lesion is typically not attached to the underlying bone and can be easily separated from the surrounding tissues. The diagnosis is based on clinical and radiographic examinations and generally confirmed by histopathological analyses.

Osseous choristoma is a rare entity in the oral and maxillofacial region. The most common site is the tongue, followed by the buccal mucosa. Osseous choristoma of the muscle is unusual and few cases have been described in the literature. No reports have described osseous choristoma arising on the medial side of the lateral pterygoid muscle. Herein, we report the first such case. A 61-year-old woman was referred to our facility for treatment of temporomandibular joint disorder. Computed tomography (CT) revealed two osseous lesions on the medial side of the lateral pterygoid muscle. Preoperatively, a three-dimensional (3D) life-sized model of the skull was fabricated from the CT imaging data. The 3D skull model was used to clarify the 3D positional relationships of the osseous lesions relative to the surrounding anatomical structures. Surgery to remove the osseous lesions was performed under general anesthesia. Unfortunately, only the larger of the two masses was able to be resected because of the risk of nerve and vascular injury. Histological examination revealed that the resected lesion comprised mature lamellar bone with regular osteocytes and no atypia. The diagnosis was multiple osseous choristomas based on the histological and clinical findings. [ABSTRACT FROM AUTHOR]

A healthy 18-year-old girl presented with a superotemporal epibulbar mass that was present since birth. Computed tomography revealed a cystic mass with fat-like low-density and a central oval-shaped mass that was isodense to the bone in the superotemporal region of the globe. Histopathology of the excised tumour revealed osseous choristoma and dermolipoma. Our review of literature yielded nine reported cases of epibulbar osseous choristoma within a dermolipoma and we reviewed these cases. [ABSTRACT FROM AUTHOR]

Osseous choristomas are rare benign lesions characterized by ectopic bone formation in the soft tissue of the head and neck region. Dermoscopy visualizes the morphological characteristics that are not observable by the naked eye, and may be used for the evaluation of calcification under the skin. The present study reports a case of an osseous choristoma arising in the tongue, and reveals the dermoscopic features of osseous choristoma from a surgical specimen. A 7-year-old boy was referred to the Department of Dentistry and Oral Surgery, with an asymptomatic pedunculated mass in the tongue. The lesion was removed completely with the adjacent normal tissue under general anesthesia. Dermoscopy of the surgical specimen revealed the hypovascular and homogeneous pattern of the lesion with round extruded whitish material. Based on dermoscopic findings, the presence of calcified hard tissue in the submucosa was verified by the dermatologist. Radiographic examination of the surgical specimen revealed the lesion contained a radiopaque trabeculated mass. Histologically, the lesion contained an osseous tissue, and the pathological diagnosis of osseous choristoma was made following consideration of the ectopic bony tissues that were localized away from the maxillo-mandibular bone. The postoperative course was uneventful with no signs of recurrence during the 36 months following surgery. To the best of the author's knowledge, this is the first report of evaluation of osseous choristoma using dermoscopy. The observation indicates the usefulness of dermoscopy for the diagnosis of oral ossified lesion in oral soft tissue. [ABSTRACT FROM AUTHOR]

Osseous choristoma is a rare, benign lesion of the oral cavity. This report presents a case of osseous choristoma in the submental region of a 30-year-old female subject. Her chief complaint was a painless swelling in the submental region. Panoramic radiography showed a well-defined, round, radiopaque lesion near the inferior border of the left mental region. The lesion was diagnosed as an osseous choristoma based on the histopathological examination of the surgical specimen. This paper is an attempt to bring forward a unique occurrence of osseous choristoma, which would further help the medical fraternity in improvising their knowledge, diagnosis, and treatment of this entity. [ABSTRACT FROM AUTHOR]

Osseous choristoma of the eye is a rare entity with few case reports being published in the literature. We report one such case in a 14-year old female who had a small growth in the right eye present since birth, which gradually increased in size. Excision biopsy was done. Histologically, the mass was composed of mature bone with surrounding benign adipocytes.

Background: Osseous choristoma is a very rare, benign lesion in the maxillofacial region. It appears as a benign mass of normally matured bony tissue covered by the normal epithelium of the tongue. It is usually seen in front of the foramen cecum of the tongue. Surgical excision is the treatment of choice with an excellent prognosis and there have been very few cases of recurrence.Case Presentation: Here we present two cases of osseous choristoma on the dorsum of the tongue. Case 1 was a 15-year-old Japanese girl who presented with a painless but gradually growing swelling on the dorsum of her tongue approximately 1 year before her admission. Case 2 was a 21-year-old Japanese woman with a complaint of pain in the lower left, posterior side of her mouth. Histological findings showed that both lesions were composed of well-organized, mature, compact bone beneath the oral mucosal membrane. Subsequent to simple surgical excision, no recurrence of the lesions was observed after the follow-up period. Previous literatures have proposed both malformation and trauma hypotheses as the etiopathologies of osseous choristoma. However, the histopathological findings of the two cases in the present study do not support the trauma hypothesis.Conclusions: Although osseous choristoma is clinically a benign condition, the underlying histopathological processes are important. The outcome of aberrant formation of calcified tissue in the vicinity of vital structures such as nerves and blood vessels may be of clinical significance. [ABSTRACT FROM AUTHOR]

Osseous choristomas are benign lesions that are characterized by ectopic bone formation in the soft tissue of the head and neck region. However, the pathophysiological mechanism responsible for ossification remains unclear. In this paper, we report a case of an osseous choristoma arising in the buccal mucosa and present a review of the relevant literature. We also carried out an immunohistochemical study of bone morphogenetic protein (BMP)-2 and -4, the potent inducers of ectopic bone formation, to identify the characteristics of bone-forming cells in the lesion. An 86-year-old woman was referred to our department because of an asymptomatic mass in the buccal mucosa. The lesion was 7mm in size, and was excised under general anesthesia. The postoperative course was uneventful, with no signs of recurrence during the 24 months after surgery. Histologically, the lesion contained a lobular-shaped osseous tissue with a fibrous capsule, and the pathological diagnosis of osseous choristoma was made in consideration of the ectopic bony tissues that were localized away from the maxillo-mandibular bone. Immunohistochemical examination showed the first evidence of expression of BMP-2 and -4 in the osseous choristoma. BMPs were expressed in the osteoblasts surrounding the ectopic bone. Our results indicated that BMP-2 and -4 was associated with the ossification of the osseous choristomas. [ABSTRACT FROM AUTHOR]

Lingual osseous choristoma is an extremely rare condition, of which only 61 cases have been reported. Monserrat in 1913 was the first to report this bony lesion on the dorsum of the tongue and it was labelled as lingual osteoma, the term that normally describes neoplastic pathology. Krolls et al changed this term later to osseous choristoma, which means normal tissue in an abnormal location. The aetiology and pathogenesis of lingual osseous choristoma remain debatable. We report a case of lingual osseous choristoma and review the literature.

Abstract: Osseous choristoma is a rare, benign lesion which usually develops in the tongue adjacent to the foramen caecum. This report presents a case occurring in the palatal region, as well as a review of the literature. A differential diagnosis of this condition from other bone-forming lesions of the soft tissue is also discussed. [Copyright &y& Elsevier]

This report presents a case of osseous choristoma in the submandibular region of a 33-year-old female. Her chief complaint was painless swelling in the submandibular region. Panoramic radiography showed a well-defined, round, radiopaque lesion near the inferior border of the right mandibular angle. Coronal and sagittal tomographic images indicated a high-density area in the right submandibular region with no bony connection. The lesion was diagnosed as an osseous choristoma based on histopathological examination of the surgical specimen. A 1-year follow-up period was uneventful. [ABSTRACT FROM AUTHOR]

Choroidal osteoma is a rare, benign, ossifying tumour of the choroid of unknown aetiology. In contrast to other types of intraocular ossification, choroidal osteoma is found typically in young healthy females in the second or third decades of life with no history of systemic or ocular disease. Choroidal osteoma is a deep, pale yellow lesion with distinct geographic borders at the juxtapapillary or macular region, with branching ‘spider’ vessels on the surface of the tumour. These features should help differentiate choroidal osteoma from other types of intraocular tumour and the diagnosis can be confirmed with ultrasonography and computerised tomography. Here we report an initially unilateral case of choroidal osteoma, which decalcified over 20 years but during the same period the fellow eye also developed a choroidal osteoma to become a bilateral case. Despite the benign nature of the tumour, vision may be compromised by gradual atrophy of the overlying retina, serous retinal detachment, accumulation of sub-retinal fluid and sub-retinal haemorrhage associated with choroidal neovascularisation. Frequent examinations are recommended for patients with choroidal osteoma, for early detection of a subretinal neovascular membrane and potential treatment with laser photocoagulation. [ABSTRACT FROM AUTHOR]

Summary: Choristomas are defined as proliferations of histologically normal tissue located in an abnormal position. Osseous choristomas of oral soft tissue are rare lesions, especially in children, occurring most frequently in the tongue, and less commonly in other sites such as buccal mucosa, palate and alveolar mucosa. It has been suggested that osseous choristomas have developmental or traumatic origins. Definite diagnosis can only be determined after histologic examination, whereupon the treatment of choice is surgical excision. Here we present, what is to our knowledge, a second case of buccal osseous choristoma in a pediatric patient, along with a brief review of the current, pertinent literature. [Copyright &y& Elsevier]

Osseous choristoma is a normal bone tissue in an ectopic position. These are slow growing lesions that are usually completely asymptomatic and only present when there is a disruption in the function of the organ due to its large size as it grows. Definitive diagnosis is obtained only after the histopathological examination. The etiology remains still questionable. The treatment of choice is surgical excision. Here we report a case of choristoma in the lower labial mucosa in a 47-year-old female. [ABSTRACT FROM AUTHOR]

Abstract: Osseous choristoma is a rare, benign lesion that presents at an abnormal location as a tumor-like mass comprising mature bone tissue. We report the case of a 50-year-old man who developed osseous choristoma in the submandibular legion. The patient was referred to our clinic in May 2011 with a 4-year history of a progressively growing tumor-like swelling in the submandibular region. The lesion was a hard, mobile, well-circumscribed, globular mass. Computed tomography revealed a heterogeneous high-density mass on the left side of the submandibular region. There was no bony connection to the mandible. Bone scanning revealed an increased uptake of 99mTc labeled hydroxymethylene diphosphonate by the lesion. The tumor was resected via an extraoral approach under general anesthesia. During surgery, it was observed that the tumor was not closely adherent to adjacent structures such as muscles or the submandibular salivary gland. Histopathological examination of the resected specimen revealed features indicative of osseous choristoma. The postoperative course was uneventful and there has been no evidence of recurrence till date. [Copyright &y& Elsevier]

Epibulbar osseous choristoma occurs rarely and is commonly mistaken for a dermoid or dermolipoma. We report two cases: an 8-year-old boy and a 79-year-old lady with epibulbar osseous choristomas where computed tomography showed an extraocular lesion in the temporal quadrant and diagnosis was confirmed by excision biopsy. The osseous component was adherent to the sclera in the young patient, while it was loosely attached to the surrounding tissue in the older patient. We believe that the 79-year-old lady is the oldest reported patient with an epibulbar osseous choristoma. [ABSTRACT FROM AUTHOR]

Summary: Purpose: Osseous choristoma is a rare, benign lesion of the oral cavity and is usually found in the tongue. It presents as a tumour-like mass of normal bony structure with mature cells in an abnormal position. The object of this paper is to report one case of osseous choristoma. Patient: A 32-year-old male presented with a lesion in the submandibular region, which was treated by excision. After 28 months of follow-up there was no recurrence. Conclusion: Upon reviewing the English literature, no previous case of an osseous choristoma located in the submandibular region has been found. Extended clinical and radiographic follow-up is necessary after surgical excision of an osseous choristoma, despite its benign nature. [Copyright &y& Elsevier]

We present the case of a 3-year-old male child with an epibulbar bone choristoma. The patient presented with a hard consistency subconjunctival mass of 8×10mm in the superior-temporal quadrant of his right eye along with vascularisation and a long cilium of approximately 8 to 10mm that touched the corneal surface. The histopathology study showed the presence of trabeculae of mature, compact bone surrounded by fibrous tissue, as well as Havers channels with concentric rings of laminar bone without bone marrow, and with normal osteocytes which defined the diagnosis of epibulbar bone choristoma. Osseous choristoma is the rarest type of the ocular choristoma and should be considered as a differential diagnosis among paediatric epibulbar tumours., (Copyright © 2020 Sociedad Española de Oftalmología. Publicado por Elsevier España, S.L.U. All rights reserved.)

Osseous choristoma is a rare entity in the oral and maxillofacial region. The most common site is the tongue, followed by the buccal mucosa. Osseous choristoma of the muscle is unusual and few cases have been described in the literature. No reports have described osseous choristoma arising on the medial side of the lateral pterygoid muscle. Herein, we report the first such case. A 61-year-old woman was referred to our facility for treatment of temporomandibular joint disorder. Computed tomography (CT) revealed two osseous lesions on the medial side of the lateral pterygoid muscle. Preoperatively, a three-dimensional (3D) life-sized model of the skull was fabricated from the CT imaging data. The 3D skull model was used to clarify the 3D positional relationships of the osseous lesions relative to the surrounding anatomical structures. Surgery to remove the osseous lesions was performed under general anesthesia. Unfortunately, only the larger of the two masses was able to be resected because of the risk of nerve and vascular injury. Histological examination revealed that the resected lesion comprised mature lamellar bone with regular osteocytes and no atypia. The diagnosis was multiple osseous choristomas based on the histological and clinical findings.