Table 1.

Summary table for inflammatory pseudotumor of the urinary bladder.

Etiology	Unknown.
Incidence	Rare, 81 cases reported.
Gender ratio	Male to female ratio of 11:6.
Age predilection	Young adults, with an average age of 28 years.
Risk factors	Recurrent cystitis and prior urinary bladder surgery.
Clinical presentation	Hematuria, anemia, frequency and dysuria. Urinary tract obstruction may occur.
Treatment	Conservative surgery: transurethral tumor resection or partial cystectomy.
Prognosis	Good. No recurrence reported after surgery.
Findings on imaging	Exophytic or polypoid urinary bladder mass. Ultrasound: hypoechoic or hyperechoic CT: ranging from hypo to hyperattenuating MR: hypointense on T1 and T2-weighted images Contrast-enhanced CT and MR: early peripheral enhancement. Central areas may show late enhancement.
Findings on pathology	Spindle cell proliferation mixed with inflammatory infiltrate.