Benign nerve sheath tumors on urinary bladder biopsy

Area of Science:

• Urology
• Oncology
• Pathology

Background:

• Benign nerve sheath tumors, including schwannoma and neurofibroma, rarely involve the urinary bladder.
• Existing literature primarily consists of case reports and limited series.

Purpose of the Study:

• To analyze the characteristics, presentation, and management of urinary bladder schwannomas and neurofibromas.
• To highlight the diagnostic challenges and treatment implications of different neurofibroma subtypes.

Main Methods:

• Retrospective review of 8 cases (6 neurofibromas, 2 schwannomas) involving the urinary bladder.
• Analysis of patient demographics, symptoms, imaging, treatment, and follow-up data.

Main Results:

• Patients ranged from 3 to 69 years old, with common symptoms including recurrent infection and hematuria.
• Lesions were solitary in 3 cases and multifocal in 4 cases.
• No recurrence or malignant transformation was observed during follow-up (average 47 months).
• Plexiform neurofibromas require careful diagnosis due to potential association with neurofibromatosis.

Conclusions:

• Urinary bladder schwannomas and neurofibromas are rare but manageable benign tumors.
• Accurate subtyping of neurofibromas is essential for guiding treatment and identifying associated conditions like neurofibromatosis.
• Focal lesions are amenable to conservative excision with low recurrence risk, while diffuse types may require more extensive management.