Myofibroblastic Pseudotumour of the Urinary Bladder in a Young Male : A Case Report

Inflammatory myofibroblastic pseudotumors (IMT) are rare spindle cell tumors, most commonly affecting the lungs (1). The urinary bladder is the IMT site in many cases, but such tumors in Asian populations are extremely rare, with only 15 cases having been reported (2). The bladder is the most commonly affected site in the genitourinary system (2). It is not clear whether IMT is an inflammatory process or a true neoplasm, as the risk of distant metastasis is very low whereas local invasion is common (3). IMTs of the urinary blad¬der are difficult to distinguish from other proliferating and malig¬nant spindle cells (3). The most common malignancies in the urinary bladder include sarcomatoid carcinoma and leiomyosarcoma. Since IMTs are controlled by local treatment, differential diagnosis is important and can help avoid unnecessary aggressive treatments (e.g. radical cystectomy, adjuvant radiation or chemotherapy). Herein, we present a patient with IMT of the urinary bladder who was successfully treated with local excision.