| Sumario: | Inflammatory myofibroblastic tumor (IMT) is a rare proliferative lesion that needs to be differentiated particularly from sarcoma and sarcomatoid carcinoma. We describe a 57-year-old male with IMT of the bladder who presented with the complaints of pelvic pain, hematuria, malaise, weight loss and dysuria. Ultrasonography revealed a mass 4 cm in diameter in the bladder. On computed tomography, a hyperdense, nodular mass with the maximum size of 4 cm was detected on the right lateral wall of the bladder. The bladder mass was excised by transurethral resection. Pathologic findings revealed that the tumor had spindle-shaped cells with eosinophilic cytoplasm in myxoid stroma with abundant inflammatory infiltrate. There has been no evidence of recurrent tumor in 45 months postoperatively. It is concluded that IMT needs to be differentiated particularly from sarcoma and sarcomatoid carcinoma.
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