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Abstract Malakoplakia is a rare inflammatory disorder believed to result from a defect in macrophage phagocytic function triggering a granulomatous reaction. It can present with genitourinary, gastrointestinal, or cutaneous manifestations in immunocompromised or, less commonly, immunocompetent hosts. We describe a case of renal malakoplakia in a young, otherwise healthy patient presenting with nephromegaly and sepsis following an E. coli urinary tract infection. We discuss diagnosis and management, including antibiotic selection and the decision to pursue nephrectomy. This case highlights the potential for kidney recovery with prolonged antibiotic therapy in conjunction with adjunct immunomodulatory therapies and source control.

Malakoplakia is a rare inflammatory disorder which typically occurs in immunocompromised patients secondary to impaired bactericidal activity of macrophages. While this entity commonly arises in the genitourinary and gastrointestinal tracts, lesions of the head and neck have been reported only rarely, with oral cavity involvement reported in 3 cases. The most common presentation of head and neck malakoplakia is that of a cutaneous flesh-colored papule or nodule. This case report, however, illustrates the first time malakoplakia is identified affecting the maxilla and maxillary alveolar ridge mucosa. Histochemical and immunohistochemical stains are presented and include positivity for PAS, von Kossa stain, iron stain, and CD68 and negativity for GMS and Gram stains, indicating an inability to demonstrate microbial infection. Thus, clinicians and pathologists alike should be aware of malakoplakia as a pathologic entity when forming differential diagnoses, particularly in immunosuppressed individuals. [ABSTRACT FROM AUTHOR]

Malakoplakia is a rare inflammatory disorder believed to result from a defect in macrophage phagocytic function triggering a granulomatous reaction. It can present with genitourinary, gastrointestinal, or cutaneous manifestations in immunocompromised or, less commonly, immunocompetent hosts. We describe a case of renal malakoplakia in a young, otherwise healthy patient presenting with nephromegaly and sepsis following an E. coli urinary tract infection. We discuss diagnosis and management, including antibiotic selection and the decision to pursue nephrectomy. This case highlights the potential for kidney recovery with prolonged antibiotic therapy in conjunction with adjunct immunomodulatory therapies and source control. [ABSTRACT FROM AUTHOR]

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Abstract Background Malakoplakia is a rare chronic granulomatous disease characterized by the presence of Michaelis-Gutmann bodies (MGBs) within histiocytic aggregates. It predominantly affects immunocompromised individuals, including those living with Human Immunodeficiency Virus (HIV). Case Presentation We present a unique case of bifocal malakoplakia in a 49-year-old man, previously with Coronavirus disease 2019 (COVID-19) and HIV positive, presented with respiratory symptoms, weight loss, and lymphadenopathy. He had various infections including Non-Tuberculous Mycobacteria (NTM), Cytomegalovirus (CMV), and Candida, with evolving lung and gastrointestinal issues. Despite treatment attempts, he deteriorated due to respiratory distress, multi-organ failure, and coagulopathy, leading to his unfortunate demise. Conclusion This report presents a distinctive and complex case of malakoplakia in an HIV-positive patient, a rare inflammatory disorder originally described by Michaelis and Gutmann in 1902. The hallmark Michaelis-Gutmann organisms were observed, confirming the diagnosis. While typically affecting the urinary tract, this case demonstrates the exceptional ability of malakoplakia to manifest in various organ systems, including pulmonary, gastrointestinal, and more. Although Escherichia coli is a prevalent associated pathogen, the exact cause remains elusive. Treatment, often involving surgical excision and antibiotic therapy, underscores the challenging nature of managing this condition in immunocompromised individuals.

Background: Malakoplakia is a rare chronic granulomatous disease characterized by the presence of Michaelis-Gutmann bodies (MGBs) within histiocytic aggregates. It predominantly affects immunocompromised individuals, including those living with Human Immunodeficiency Virus (HIV). Case Presentation: We present a unique case of bifocal malakoplakia in a 49-year-old man, previously with Coronavirus disease 2019 (COVID-19) and HIV positive, presented with respiratory symptoms, weight loss, and lymphadenopathy. He had various infections including Non-Tuberculous Mycobacteria (NTM), Cytomegalovirus (CMV), and Candida, with evolving lung and gastrointestinal issues. Despite treatment attempts, he deteriorated due to respiratory distress, multi-organ failure, and coagulopathy, leading to his unfortunate demise. Conclusion: This report presents a distinctive and complex case of malakoplakia in an HIV-positive patient, a rare inflammatory disorder originally described by Michaelis and Gutmann in 1902. The hallmark Michaelis-Gutmann organisms were observed, confirming the diagnosis. While typically affecting the urinary tract, this case demonstrates the exceptional ability of malakoplakia to manifest in various organ systems, including pulmonary, gastrointestinal, and more. Although Escherichia coli is a prevalent associated pathogen, the exact cause remains elusive. Treatment, often involving surgical excision and antibiotic therapy, underscores the challenging nature of managing this condition in immunocompromised individuals. [ABSTRACT FROM AUTHOR]

Malakoplakia is a granulomatous tissue inflammation with a characteristic histological appearance, mainly affecting the urogenital system and morphologically reflecting a macrophage disease. If bladder involvement is the most common, renal involvement is very rare and may be responsible for a differential diagnosis problem with renal cell carcinoma.We present a clinical case of renal malacoplakia mimicking malignant renal cell carcinoma diagnosed after partial nephrectomy in a 58-year-old woman with no history of recurrent urinary infections.

Malakoplakia is a rare chronic inflammatory condition that most commonly involves the urogenital tract. Cutaneous malakoplakia is extremely rare and many patients diagnosed with skin involvement are immunosuppressed. While the clinical presentation of cutaneous malakoplakia is variable, the histopathologic features are quite distinct and include sheets of closely packed dermal histiocytes with foamy‐appearing cytoplasm and Michaelis–Gutmann bodies that are positive with certain immunohistochemical stains. While the exact pathogenesis of malakoplakia is unknown, it has been associated with certain bacterial infections. Treatment generally involves a combination of surgery and antimicrobial agents and/or modulation of immunosuppressant therapy if appropriate. Herein, the authors report a unique case of cutaneous malakoplakia arising in a patient on chronic immunosuppressive therapy for the management of pyoderma gangrenosum. [ABSTRACT FROM AUTHOR]

Abstract Background Malakoplakia is a rare inflammatory disease of the urogenital tract. There have been no reports of malakoplakia expressing anaplastic lymphoma kinase (ALK) to date. Here, we present one case of malakoplakia with aberrant ALK expression by immunohistochemistry and discuss the clinical significance. Case presentation A 65-year-old Chinese woman with a history of diabetes presented with solid masses in the liver and kidney and elevated lesions on the mucosal surface of the colon. Right nephrectomy and partial liver resection were performed. Microscopically, sheets of histiocytes with poor intercellular adhesion were seen, with Michaelis–Gutmann bodies present in both the intracellular and extracellular interstitium. CD10-, CD68-, and CD163-positive cells were present, with Michaelis–Gutmann bodies confirmed by staining with Alcian blue, periodic acid-Schiff (PAS), periodic acid-Schiff with diastase, Von Kossa, and Prussian blue. Aberrant ALK1 and ALK (D5F3) expression was observed in the cytoplasm and nucleus of cells. However, ALK gene mutation was not detected by fluorescence in situ hybridization or whole exome next-generation sequencing. NGS revealed nine individual somatic gene mutations: GOT1L1, GLIS2, SPOUT1, TMEM97, MUC3A, NSD2, SFXN5, ADAD1 and RAD50. The significance of the somatic gene mutations detected in this study is not clear, and the relationship between them and malakoplakia cannot be clarified by existing scientific studies. The pathological diagnosis was malakoplakia with aberrant ALK expression by immunohistochemistry. The antibiotics imipenem and vancomycin were started based on the results of drug sensitivity analysis and the patient was subsequently discharged. She experienced no discomfort during 30 months of follow-up. Conclusion This is the first reported case of malakoplakia with aberrant ALK expression, it should be differentiated from ALK-positive histiocytosis to avoid misdiagnosis.

Abstract Background Malakoplakia is a rare granulomatous inflammatory condition that can affect immunosuppressed patients. The genitourinary system is the most involved organ. We present a case of kidney failure caused by obstructing bladder lesions, clinically suspicious for malignancy and pathologically proven to be malakoplakia. Case presentation A 70-year-old woman presented with acute kidney injury and Escherichia coli (E.coli) bacteremia. Investigation showed bilateral hydronephrosis with thickening of the renal pelvises suggestive of urothelial malignancy. Cystourethroscopy revealed multiple bladder lesions completely obliterating both ureteral orifices. Pathology of the resected lesions confirmed the diagnosis of malakoplakia. Patient was treated with a prolonged antibiotic course over 6 months with recovery of her kidney function. Conclusion Malakoplakia can mimic invasive tumors, and the diagnosis is only attained through histopathology which uniquely demonstrates the pathognomonic Michaelis–Gutmann inclusions inside sheets of histiocytes. Treatment is largely dependent on prolonged antibiotics therapy that must cover the most common isolated pathogen, E.coli.

Malakoplakia is a rare granulomatous inflammatory disorder. Its diagnosis depends on histopathological findings; however, high-quality literature regarding proper medical/surgical treatment is lacking. A 38-year-old diabetic female patient was admitted to the emergency room with a history of lower gastrointestinal hemorrhage. Colonoscopy revealed a lesion in the descending colon, and abdominal computed tomography revealed a splenic flexure mass involving the lower pole of the spleen and upper pole of the left kidney. Biopsies confirmed the diagnosis of malakoplakia. After completing antibiotic treatment, a restaging computed tomography revealed a discrete mass increase; hence, the patient underwent laparoscopic en bloc colectomy and partial nephrectomy. Postoperatively, the patient developed a pancreatic fistula, which was successfully treated with percutaneous drainage and antibiotics. The presence of pathognomonic Michaelis-Gutmann inclusions on histopathology is frequently reported as the key to diagnosing malakoplakia. Herein, we present a successful, minimally invasive surgical treatment for colonic malakoplakia.

Abstract Background Malakoplakia is a rare condition characterized by inflammatory masses with specific histological characteristics. These soft tissue masses can mimic tumors and tend to develop in association with chronic or recurrent infections, typically of the urinary tract. A specific defect in innate immunity has been described. In the absence of randomized controlled trials, management is based on an understanding of the biology and on case reports. Case presentation Here we describe a case of presacral malakoplakia in a British Indian woman in her late 30s, presenting with complex unilateral foot drop. Four years earlier, she had suffered a protracted episode of intrapelvic sepsis following a caesarean delivery. Resection of her presacral soft tissue mass was not possible. She received empiric antibiotics, a cholinergic agonist, and ascorbic acid. She responded well to medical management both when first treated and following a recurrence of symptoms after completing an initial 8 months of therapy. Whole exome sequencing of the patient and her parents was undertaken but no clear causal variant was identified. Conclusions Malakoplakia is uncommon but the diagnosis should be considered where soft tissue masses develop at the site of chronic or recurrent infections. Obtaining tissue for histological examination is key to making the diagnosis. This case suggests that surgical resection is not always needed to achieve a good clinical and radiological outcome.

Background: Malakoplakia is a rare disorder 75% of the reported cases affect mainly the genitourinary tract, its occurrence in the adrenal gland is extremely rare. Case presentation: A 65-year-old female patient presented to the emergency department for chronic abdominal pain. Radiographic and biochemical studies revealed a left adrenal incidentaloma and left adrenalectomy was performed. Histological examination showed the presence of Michaelis-Gutmann bodies, compatible with a malakoplakia of the adrenal gland. Conclusions: Malakoplakia is a rare disorder, with non-standardized treatment, medical and surgical therapies appear to be effective in treating the condition.

Background: Malakoplakia is a rare inflammatory disease of the urogenital tract. There have been no reports of malakoplakia expressing anaplastic lymphoma kinase (ALK) to date. Here, we present one case of malakoplakia with aberrant ALK expression by immunohistochemistry and discuss the clinical significance. Case presentation: A 65-year-old Chinese woman with a history of diabetes presented with solid masses in the liver and kidney and elevated lesions on the mucosal surface of the colon. Right nephrectomy and partial liver resection were performed. Microscopically, sheets of histiocytes with poor intercellular adhesion were seen, with Michaelis–Gutmann bodies present in both the intracellular and extracellular interstitium. CD10-, CD68-, and CD163-positive cells were present, with Michaelis–Gutmann bodies confirmed by staining with Alcian blue, periodic acid-Schiff (PAS), periodic acid-Schiff with diastase, Von Kossa, and Prussian blue. Aberrant ALK1 and ALK (D5F3) expression was observed in the cytoplasm and nucleus of cells. However, ALK gene mutation was not detected by fluorescence in situ hybridization or whole exome next-generation sequencing. NGS revealed nine individual somatic gene mutations: GOT1L1, GLIS2, SPOUT1, TMEM97, MUC3A, NSD2, SFXN5, ADAD1 and RAD50. The significance of the somatic gene mutations detected in this study is not clear, and the relationship between them and malakoplakia cannot be clarified by existing scientific studies. The pathological diagnosis was malakoplakia with aberrant ALK expression by immunohistochemistry. The antibiotics imipenem and vancomycin were started based on the results of drug sensitivity analysis and the patient was subsequently discharged. She experienced no discomfort during 30 months of follow-up. Conclusion: This is the first reported case of malakoplakia with aberrant ALK expression, it should be differentiated from ALK-positive histiocytosis to avoid misdiagnosis. [ABSTRACT FROM AUTHOR]

Background: Malakoplakia occurs uncommonly at any age, but pediatric reports are exceptionally limited. Malakoplakia appears primarily in the urinary tract, although involvement of essentially all organs has been reported, cutaneous malakoplakia is very uncommon and liver involvement is the rarest. Method: We report the first pediatric case of concurrent hepatic and cutaneous malakoplakia in a pediatric liver transplant recipient. We also provide a literature review for cutaneous malakoplakia cases in children. Result: A 16‐year‐old male received a deceased‐donor liver transplant for autoimmune hepatitis, present with the persistence of the liver mass of unknown etiology and cutaneous plaque‐like lesions around the surgical scar. Core biopsies taken from the skin and abdominal wall lesions demonstrated histiocytes containing Michaelis‐Gutmann bodies (MGB) revealing the diagnosis. The patient successfully was treated with antibiotics alone for 9 months without surgical intervention or a decrease in immunosuppressive therapy. Conclusion: This case demonstrates the need to include malakoplakia in the differential diagnosis of mass‐forming lesions after solid transplantation and increase awareness of this very rare entity in pediatrics. [ABSTRACT FROM AUTHOR]

Malakoplakia is a rare chronic granulomatous disease usually affecting the urinary bladder and other locations. In humans, the gastrointestinal tract is the second most common location but there are no reports of intestinal malakoplakia in animals. A 10-month-old female French Bulldog was presented with chronic haemorrhagic diarrhoea and anorexia with normochromic-normocytic anaemia and hypoalbuminaemia. Grossly, there was mucosal thickening and ulceration of the caecum, colon and rectum. Microscopically, transmural sheets of foamy macrophages were seen in these tissues. Macrophages were periodic acid–Schiff, vimentin and ionized calcium-binding adaptor molecule 1 positive and contained von Kossa- and Prussian blue-positive Michaelis–Gutmann bodies. Giemsa staining revealed rod-shaped bacterial colonies and fluorescence in-situ hybridization demonstrated Escherichia coli within macrophages. This is the first reported case of intestinal malakoplakia in domestic animals. Pathological features of intestinal malakoplakia share many similarities with ulcerative histiocytic colitis in dogs but it is unclear if they are different forms of the same pathological process or distinct entities. [ABSTRACT FROM AUTHOR]

Background: Malakoplakia is a rare acquired chronic infectious granulomatous condition, that is characterized by the accumulation of large granular macrophages containing basophilic inclusion bodies in the cytoplasm termed Michaelis-Gutmann (MG) bodies. Malakoplakia most commonly involves the genitourinary system, and the second most commonly affected site is the gastrointestinal tract. Rectal malakoplakia is an unusual entity that is difficult to diagnose due to its diverse clinical manifestations and radiological findings that are similar to different diseases and advanced cancers. Case description: A 61-year-old male patient presented with difficulty in urination and defecation that started 4 months prior, along with a weight loss of 10 kg. Abdominal computerized tomography (CT) scanning revealed diffuse lesions of the perirectal region with multiple lymphadenopathies and involvement of the bladder, prostate, bilateral seminal vesicles, and left ureter. 18F-FDG PET/CT MIP showed intense FDG uptake in the rectal region, and a diagnosis of an occupying lesion was proposed. Colonoscopy and histological examination of rectal lesion biopsies showed the characteristic features of malakoplakia. Conclusion: Malakoplakia of the rectum with lymph node involvement and adjacent organ extension has been extensively misdiagnosed in clinical practice, and mimics malignancy radiologically. It is of great importance for radiologists to be aware of malakoplakia when making the differential diagnosis of benign and malignant mass lesions of the rectum, although the radiologic findings are nonspecific. Endoscopic evaluation and pathologic examination of a biopsy should be recommended to make the correct diagnosis, which may prevent unnecessary surgical resection.

Malacoplakia is a chronic granulomatous disease associated with immunosuppression and infection that mainly affects the bladder. It is characterized by the presence of nodules, plaques or ulcers in the bladder, lower urinary tract symptoms and hematuria. It can mimic the clinical picture of bladder cancer. The case of a 66-year-old female patient with hematuria and lower urinary tract symptoms is presented. Initially, high-grade urothelial carcinoma was diagnosed, but after histopathological review, the diagnosis of malacoplakia was confirmed. Medical treatment was started, and the condition is currently in remission. Malacoplakia is an extremely rare disease that should be considered in patients with recurrent urinary tract infections and tumor findings on cystoscopy, since it can be confused with bladder cancer. Early diagnosis and treatment are important to avoid unnecessary surgical interventions and associated complications. [ABSTRACT FROM AUTHOR]

Renal malakoplakia is a rare inflammatory disorder that predominantly affects the bladder, but has also been known to affect the kidneys. We present a case of a young woman with renal malakoplakia and concomitant E. coli bacteremia. The patient underwent numerous imaging studies during her clinical evaluation including ultrasound, magnetic resonance imaging, and computed tomography with 3-dimensional and cinematic renderings. Diagnosis was ultimately confirmed with renal biopsy which demonstrated Michaelis-Gutman bodies, a pathognomonic pathological finding in malakoplakia. She was started on antibiotics as well as bethanechol and ascorbic acid. Although her renal function improved with this treatment, she continued to have signs and symptoms of infection and she is planned for upcoming left nephrectomy.

Background: Malakoplakia is a rare condition characterized by inflammatory masses with specific histological characteristics. These soft tissue masses can mimic tumors and tend to develop in association with chronic or recurrent infections, typically of the urinary tract. A specific defect in innate immunity has been described. In the absence of randomized controlled trials, management is based on an understanding of the biology and on case reports. Case presentation: Here we describe a case of presacral malakoplakia in a British Indian woman in her late 30s, presenting with complex unilateral foot drop. Four years earlier, she had suffered a protracted episode of intrapelvic sepsis following a caesarean delivery. Resection of her presacral soft tissue mass was not possible. She received empiric antibiotics, a cholinergic agonist, and ascorbic acid. She responded well to medical management both when first treated and following a recurrence of symptoms after completing an initial 8 months of therapy. Whole exome sequencing of the patient and her parents was undertaken but no clear causal variant was identified. Conclusions: Malakoplakia is uncommon but the diagnosis should be considered where soft tissue masses develop at the site of chronic or recurrent infections. Obtaining tissue for histological examination is key to making the diagnosis. This case suggests that surgical resection is not always needed to achieve a good clinical and radiological outcome. [ABSTRACT FROM AUTHOR]

Malakoplakia is a rare, granulomatous disease that usually affects immunocompromised individuals and is generally associated with poor graft and patient survival. We present a case of renal malakoplakia after kidney transplantation (KT). A 33-year-old female patient with chronic kidney disease underwent living-donor KT at Severance Hospital. The patient was administered 375 mg/m2 rituximab due to high panel reactive antibodies. Immunosuppression was initiated with 1.5 mg/kg anti-thymocyte globulin and intravenous methylprednisolone and maintained with tacrolimus, oral methylprednisolone, and mycophenolate mofetil (MMF). Six months after KT, the patient was hospitalized for a urinary tract infection with an elevated serum creatinine level of 3.14 mg/dL. Renal biopsy revealed malakoplakia involving the renal parenchyma. Upon this diagnosis, the dose of tacrolimus was reduced and MMF was stopped. Fluoroquinolone was used for 16 days, and the trimethoprim/sulfamethoxazole dose was doubled for 6 days. The patient was hospitalized for 3 weeks and closely observed during outpatient visits. Follow-up ultrasonography revealed mass-like lesions of renal malakoplakia, which disappeared 5 months after diagnosis. The serum creatinine level decreased to 1.29 mg/dL 28 months after diagnosis. Our results suggest that renal malakoplakia can be successfully treated by the reduction of immunosuppression and sustained antimicrobial therapy.

In the head-neck region, experiencing infectious, inflammatory, and malignant masses is a common fact. However, some pathologies are rarely seen in the head and neck area, and one of them is malakoplakia. Malakoplakia is generally a slow-growing benign tumor in the urogenital region. Diagnosis is made microscopically with the appearance of Michaelis-Guttman bodies. This case report presents a 32-year-old patient with a history of early-stage tongue squamous cell cancer. In the routine follow-up of the patient, a mass with similar features to malignancy and a definitive pathological diagnosis of malakoplakia was detected. In this case report, the characteristics of the patient and the mass are discussed comprehensively. [ABSTRACT FROM AUTHOR]

Colonic malakoplakia is an uncommon granulomatous development of cells resulting from the impaired capacity of the mononuclear cells to eliminate the phagocytosed bacteria, and in rare cases it can also affect the gastrointestinal tract. We report the case of a 78-year-old female patient that was admitted to hospital by The Emergency Department with the diagnosis of bowel obstruction, confirmed by the clinical and paraclinical investigations. We decided to surgically manage the case for suspicious symptomatic colonic neoplasm. The histological examination of the surgical specimens revealed colonic malakoplakia, characterized by the presence of the aggregated granular histiocytes and Michaelis-Gutmann bodies. Through this paper, we want to raise awareness for Malakoplakia, which remains an extremely rare disease that may affect multiple organs, and because it does not present specific symptoms or clinical manifestations, the final diagnosis remains the histopathological study. The clinical conduct should be decided after taking into consideration all the aspects of this pathology along with the benefits and risks for the patient. [ABSTRACT FROM AUTHOR]

Pulmonary malakoplakia is a rare lung lesion more frequently found in immunocompromised patients than in immunocompetent individuals. In this study, we report the challenging case of a young immunocompetent patient with an irregular pulmonary nodule with peripheral cysts who, after undergoing surgery, was diagnosed with malakoplakia. Due to the rarity of the disease and the similarity of this condition to malignant neoplasms, cytopathological or histopathological examinations are necessary for the correct diagnosis. A description of pulmonary malakoplakia with peripheral cysts has not been previously published in the literature.

Prostatic malakoplakia (MP) is rare, with only case reports and small series (< five patients) available in the literature. In this study we analysed an international multi‐institutional series of 49 patients with prostatic MP to more clearly define its clinicopathological features. The median age was 67 years and the median serum prostate‐specific antigen (PSA) was 7.5 ng/ml. MP was clinically manifest in most cases (28 of 45 patients with data available, 62%). Of 43 patients with detailed clinical history available, 21 (49%) had concurrent or metachronous malignancies (including prostate cancer). Diabetes or insulin resistance was present in 11 patients (26%). Additionally, three patients had a history of solid organ transplantation and one had HIV. Of note, six of 34 patients (18%) without concurrent prostate cancer had an abnormal digital rectal examination and/or lesions on magnetic resonance imaging (MRI) with prostate imaging reporting and data system (PIRADS) scores 4–5. The initial diagnosis was made on core biopsies (25 of 49, 51%), transurethal resection specimens (12 of 49, 24%), radical prostatectomies (10 of 49, 20%), Holmium‐laser enucleation (one of 49, 2%) and cystoprostatectomy (one of 49, 2%). Tissue involvement was more commonly diffuse or multifocal (40 of 49, 82%). Von Kossa and periodic acid‐Schiff stains were positive in 35 of 38 (92%) and 26 of 27 lesions (96%), respectively. Of note, two cases were received in consultation by the authors with a preliminary diagnosis of mesenchymal tumour/tumour of the specialised prostatic stroma. The present study suggests that prostatic MP is often associated with clinical findings that may mimic those of prostate cancer in a subset of patients. Moreover, MP may be found incidentally in patients with concurrent prostate cancer. [ABSTRACT FROM AUTHOR]

Prostatic malakoplakia is a rare chronic inflammatory disease with only a few cases reported in the literature. It is believed to be caused by an impaired histiocytic response against bacteria. This is a case report of a 65-year-old man with a history of diabetes mellitus presenting with complaints of generalized weakness and fever of 4-day duration. Laboratory investigations showed pyuria, and urine culture showed Escherichia coli. An abdominal Computerised Tomography (CT) scan revealed left-sided pyelonephritis and a prostatic abscess. Double-J stenting with Trans-Rectal Ultrasound Scan (TRUS) biopsy was done. The biopsy showed features of malakoplakia of the prostate without any associated malignancy.

The reported cases of malakoplakia concurrent with renal cell carcinoma (RCC) are exceedingly rare. Two prior cases of malakoplakia have been previously reported in patients with clear cell renal cell carcinoma. We report the third case of concurrent malakoplakia and RCC in the same kidney and the first case of malakoplakia with the papillary type of renal cell carcinoma. Our case occurred in a 73-year-old woman with urinary tract infection and diabetes who was found to have a large renal mass on imaging and underwent radical nephrectomy. Malakoplakia was present both within the tumor and in portions of kidney away from the tumor itself. The microscopic features of malakoplakia included PAS-positive histiocytes with calcium positive Michaelis-Gutmann bodies which were also seen on electron microscopy. Since malakoplakia can mimic renal cell carcinomas (RCC) clinically and pathologically, our case highlights the importance of an awareness of the possible concurrence of these two diagnoses for accurate histopathologic diagnosis and treatment of patients with both diseases.

Objective: The aim of the study is to make a review of the literature about bladder malakoplakia. Material and Methods: We searched articles on the PUBMED web-literature database with the following keywords: "vesical malakoplakia" and "bladder malakoplakia". In the literature we found 254 articles. At final we have excluded 219 articles, including in our study only 35 articles. Results: The overall average age found was 50.85 years. The average age of men was 43.22 years, while that of women was 53.37 years. 75% of the patient cases were women and 25% were men. Regarding comorbidities, in 5.55% of the cases were missing whereas 47.22% of the patients suffered from recurrent urinary tract infection (UTI) and 19.44% from immune system disorders. Urine culture was positive in 69.44% with E.coli being isolated in 92% of cases. Hydroureteronephrosis was present in 44.44% of the cases: left in 6.25% of cases, right in 18.75% and bilateral in 75%. The mean serum creatinine of patients with hydroureteronephrosis was 5.11 (1-21) mg/dl. The most frequent site of the lesion was the vesicoureteral junction (VUJ) (42.31%), followed by the trigone (38.46%). 30.56% of patients were treated with antibiotic and surgery (transurethral resection of bladder, partial or radical cystectomy), less frequent options were antibiotics alone and surgery alone. The recurrence rate was 15%. Conclusions: Malakoplakia is a disorder usually related to other affections, like UTI and immunodepression, and it seem to be caused by an abnormal macrophage function. In almost half of the described cases of isolated bladder malakoplakia, hydroureteronephrosis and renal failure were present. Treatment is not standardized, but both medical and surgical therapies are effective to avoid recurrence. [ABSTRACT FROM AUTHOR]

Malakoplakia is a rare acquired histiocytic disorder first described in the urinary bladder. There have been 8 cases reported involving the liver, and this is the first reported case of malakoplakia involving an adult transplanted liver. We report a 63-year-old man with a medical history of orthotopic liver transplantation who presented with fever, chills, and abdominal pain. Imaging found confluent microabscesses in the right lobe of the liver that persisted despite prolonged antibiotics. He was taken to the operating room for a segment 6 hepatectomy of the abscess. Histologically, the inflammatory process showed malakoplakia., (© 2024 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of The American College of Gastroenterology.)

Malakoplakia is a rare granulomatous inflammation that has mainly been reported in the urinary bladder of dogs. Only one case of canine colonic malakoplakia has been reported to date; however, successful treatment of this disease has not been reported. Here, we report a case of colonic malakoplakia in a 5-month-old spayed female French Bulldog. The dog was referred to a veterinarian because of chronic diarrhea and mucinous blood feces; empirical treatment did not improve its condition. Histologically, numerous macrophages containing periodic acid-Schiff-positive granules infiltrated the lamina propria of the large intestine. Furthermore, targetoid basophilic inclusion bodies (Michaelis-Gutmann bodies) were observed. Complete clinical remission was achieved after 8 months of enrofloxacin treatment and favorable progress after 2 months of medication.

Malakoplakia is a rare chronic inflammatory disease that has been rarely reported in the genitourinary tract, gastrointestinal tract, adrenal glands, skin, lungs, bone, and endometrium. Central nervous system malakoplakia is extremely rare, and even then, it has only been reported in the cerebrum and cerebellum. A definite diagnosis of malakoplakia depends on microscopic detection of Michaelis-Gutmann bodies. We would like to present the case of a 61-year-old male who, after undergoing a liver transplant and receiving prolonged antibiotic treatment for Escherichia coli bacteremia, presented with quadriparesis and gait disturbance. The clinical and radiologic appearance of malakoplakia mimics that of malignant tumor. This is a condition with no established appropriate treatment and presents challenges due to its spinal cord location. However, this case presents a case of spinal cord malakoplakia and may provide newly differential diagnosis of an intramedullary mass in the spinal cord.

Objective: The aim of the study is to make a review of the literature about bladder malakoplakia. Material and Methods: We searched articles on the PUBMED web-literature database with the following keywords: “vesical malakoplakia” and “bladder malakoplakia”. In the literature we found 254 articles. At final we have excluded 219 articles, including in our study only 35 articles. Results: The overall average age found was 50.85 years. The average age of men was 43.22 years, while that of women was 53.37 years. 75% of the patient cases were women and 25% were men. Regarding comorbidities, in 5.55% of the cases were missing whereas 47.22% of the patients suffered from recurrent urinary tract infection (UTI) and 19.44% from immune system disorders. Urine culture was positive in 69.44% with E.coli being isolated in 92% of cases. Hydroureteronephrosis was present in 44.44% of the cases: left in 6.25% of cases, right in 18.75% and bilateral in 75%. The mean serum creatinine of patients with hydroureteronephrosis was 5.11 (1-21) mg/dl. The most frequent site of the lesion was the vesicoureteral junction (VUJ) (42.31%), followed by the trigone (38.46%). 30.56% of patients were treated with antibiotic and surgery (transurethral resection of bladder, partial or radical cystectomy), less frequent options were antibiotics alone and surgery alone. The recurrence rate was 15%. Conclusions: Malakoplakia is a disorder usually related to other affections, like UTI and immunodepression, and it seem to be caused by an abnormal macrophage function. In almost half of the described cases of isolated bladder malakoplakia, hydroureteronephrosis and renal failure were present.Treatment is not standardized, but both medical and surgical therapies are effective to avoid recurrence.

Malakoplakia (from Greek Malako “soft” + Plako “plaque”) is a rare inflammatory condition that presents as a papule, plaque, or ulceration that usually affects the genitourinary tract. The most frequently affected organ is the urinary bladder. This condition has features of granulomatous inflammation. The pathogenesis of the disease is not completely understood. It is often misdiagnosed as malignancy. In this case report, we present a case of urinary bladder malakoplakia which presented with obstructive uropathy and acute kidney injury (AKI).

Malakoplakia is a rare chronic granulomatous disease found in the genitourinary tract, mainly. It is considered to be related to immunosuppression and/or infectious processes. We would like to present an operative case of cecal malakoplakia in a patient with a history of surgical resection and chemotherapy for cervical cancer. A 74-year-old female patient visited our hospital for 1-year follow-up after operation and chemo-radiotherapy for cervical cancer. An infiltrative mass of 6 cm, between the cecal base and the right psoas muscle, was observed on computed tomography. An ileocectomy was performed for diagnosis. Histopathologic examination revealed cecal malakoplakia. After surgery, based on previous reports, antibiotics therapy was added. Then the patient was discharged and treated in the outpatient clinic. To our knowledge, a rare case has been described of cecal malakoplakia during observation after surgery and chemo-radiotherapy for cervical cancer. Malakoplakia is known to be related to immunosuppressive condition. Therefore, our case suggests that close observation should be made in patients on immunosuppressive condition, such as chemotherapy.

No abstract available. Article truncated after 150 words. A 58-year-old woman with a history of orthotopic heart transplant, performed for Adriamycin-induced cardiomyopathy, treated with mycophenolate and tacrolimus, presented for routine interval follow up. The patient’s past medical history was significant for follicular thyroid carcinoma treated with total thyroidectomy and bilateral breast carcinoma in remission as well as hypothyroidism and type II diabetes mellitus. In addition to tacrolimus and mycophenolate, the patient’s medications included aspirin, insulin, itraconazole (for anti-fungal prophylaxis), levothyroxine, prednisone (tapering since transplant), and valganciclovir. The patient recently complained of rhinorrhea and cough productive of brown-tinged sputum, improving over the previous 2 weeks; she denied fever, chills, shortness of breath, night sweats chest pain, or gastrointestinal symptoms. Physical examination showed the patient to be afebrile with normal heart and respiratory rates and blood pressure. Her room air oxygen saturation was 99%. The patient’s complete blood count and serum chemistries showed largely normal values, with the white blood …

Malakoplakia is a rare disease that manifests as a histiocytic inflammatory process and most often occurs in the urinary bladder. It is caused by an impaired capacity of histiocytes to kill and digest bacteria. The typical histopathologic findings are sheets of histiocytes with granular eosinophilic cytoplasm and characteristic Michaelis–Gutmann bodies, spherical bodies with a targetoid appearance. Malakoplakia is even rarer in the gynecologic tract, and our literature search found only 21 published patients of malakoplakia involving the endometrium. Here we report a 60-year-old female patient who presented with recurrent pelvic infections and postmenopausal bleeding, which raised concern for an endometrial malignancy. Hysterectomy with salpingo-oophorectomy revealed malakoplakia involving the endometrium and also the right ovary. Michaelis–Gutmann bodies were visible on the intraoperative frozen section that was performed to rule out an endometrial malignancy. We summarize the clinicopathologic findings of the published patients of endometrial malakoplakia. [ABSTRACT FROM AUTHOR]

Colonic malakoplakia is an uncommon granulomatous development of cells resulting from the impaired capacity of the mononuclear cells to eliminate the phagocytosed bacteria, and in rare cases it can also affect the gastrointestinal tract. We report the case of a 78-year-old female patient that was admitted to hospital by The Emergency Department with the diagnosis of bowel obstruction, confirmed by the clinical and paraclinical investigations. We decided to surgically manage the case for suspicious symptomatic colonic neoplasm. The histological examination of the surgical specimens revealed colonic malakoplakia, characterized by the presence of the aggregated granular histiocytes and Michaelis-Gutmann bodies. Through this paper, we want to raise awareness for Malakoplakia, which remains an extremely rare disease that may affect multiple organs, and because it does not present specific symptoms or clinical manifestations, the final diagnosis remains the histopathological study. The clinical conduct should be decided after taking into consideration all the aspects of this pathology along with the benefits and risks for the patient.

Abstract Background Prostate adenocarcinoma has well known benign mimickers. Histiocytic proliferations usually impose differential diagnosis with high-grade component of acinar adenocarcinoma (Gleason pattern 5). Case presentation We present herein three cases of histiocytic lesions of the prostate in which accurate recognition avoided inappropriate upgrading (malakoplakia associated with prostate adenocarcinoma, two cases) and false positive diagnosis at biopsy (xanthoma with signet ring morphology). Conclusion In needle biopsies, pathologists should have a low threshold to perform immunostains when considering a differential diagnosis between high-grade carcinoma and a histiocytic lesion. In prostatectomy specimens, abrupt transition to solid areas in low and intermediate grade tumors should raise concern to exclude malakoplakia. PAS and von Kossa stains are inexpensive and a valuable tool to highlight typical Michaelis–Gutmann bodies.

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