[Asymptomatic paraganglioma of the bladder wall with unusual extensive submucous vascular proliferation].

Paraganglioma of the urinary bladder is a very rare tumor, which is usually diagnosed on the basis of its endocrine symptoms because of the excretion of vasoactive substances. One case of asymptomatic paraganglioma detected by chance is described, it was misdiagnosed as hemangioma because of its marked suburothelial vessel proliferation.