Bladder xanthoma: clinical analysis of 22 cases from multiple centers.

This study aims to outline the clinical and pathological characteristics of bladder xanthoma, alongside its diagnostic and treatment approaches.

Methods: We reviewed bladder xanthoma literature spanning the last 60 years from databases such as PubMed, Web of Science, Embase, and Medline. Additionally, we analyzed clinical data from a singular case of bladder xanthoma treated at our hospital. Patient particulars, including age, gender, symptoms, tumor size, associated neoplasms, imaging results, and pathological findings, were documented. Tumors underwent surgical removal, followed by pathological examination of the excised tissues. Subsequent to surgery, patients underwent cystoscopy follow-up after 3 months.

Results: Among the 22 identified cases of bladder xanthoma, 15 were solitary (comprising both single and multiple lesions), while 7 were associated with urinary tract epithelial tumors. There were 6 male patients and 1 female patient concurrently diagnosed with urinary tract epithelial carcinoma. Males exhibited an average onset age of 56.0 years, with an average tumor diameter of 21.57 mm. Females presented an average onset age of 63.00 years, with an average tumor diameter of 20.86 mm. The onset age for females was notably lower than that for males, and their tumor diameter was significantly smaller than that of males (P<0.05). Among the 9 patients with lipid metabolism disorders, 7 were males and 2 were females, indicating a marked male predominance. No instances of recurrence or malignant transformation were observed during follow-up. In this study, we treated a 65-year-old female patient who, during cystoscopy, exhibited a round, hanging lesion measuring about 2.5 × 1 × 1 cm on the left side of the ureteral opening in the bladder trigone. Post-surgery, pathological examination disclosed bladder xanthoma with multiple groups of foam cells. Immunohistochemistry findings were as follows: CD68 (+), CD163 (+), Vimentin (+), CK (-), Desmin (-). A follow-up cystoscopy after 3 months did not reveal any tumor recurrence.

Conclusion: Bladder xanthoma is an uncommon benign condition predominantly affecting older males. It frequently manifests on the side walls and trigone region of the bladder and may be linked to lipid metabolism disorders. Approximately 50% of patients exhibit concurrent urinary tract epithelial tumors, with diagnosis primarily reliant on microscopic tissue examination. Prolonged post-surgical follow-up is imperative.