A case of inflammatory myofibroblastic tumor of the urinary bladder with emergency clinical symptoms similar to bladder cancer.

A 55-year-old man was admitted for ongoing gross hematuria and bladder tamponade. Computed tomography revealed a mass near the right sidewall of the bladder, along with massive blood clots. The patient was diagnosed as having bladder cancer based on laboratory findings and emergency clinical symptoms. Thus, emergency transurethral resection of the bladder tumor was performed. Pathological examination revealed an inflammatory myofibroblastic tumor (IMT). No tumor progression was observed during the 6-month follow-up period. Owing to its rarity, IMT has not been well characterized clinically and radiologically, and thus, it is very difficult to diagnose IMT accurately without pathological examinations.