Rare pseudotumors of the urinary bladder in childhood

We report two cases of inflammatory pseudotumors of the urinary bladder one case of a chronic granulomatous pseudotumor (CGT) and one case of a pseudo sarcomatous myofibroblastic (fibromyxoid) tumor (PMT). Both tumors resemble d malignancies such as rhabdomyosarcomas regarding clinical appearance and imaging findings and represent rare urinary bladder tumors. The imaging fin dings on unenhanced and contrast-enhanced MRI as well as histological speci men are presented. Final diagnosis was made following elective surgery. Dif ferential diagnosis of urinary bladder tumors as well as the imaging findin gs of these clinically comparable cases are discussed. Awareness of these b enign lesions may prevent patients from inappropriate therapies such as che motherapy or radiation therapy.