[Bone metaplasia of the bladder associated with urothelial tumor. A clinical case]

One case report of bone metaplasia of the bladder wall associated to urothelial tumour located on the urothelium coating the lesion. Suspicion diagnosis started from findings identified in the transurethral resection. A stone-like mass attached by a pedicle to the bladder wall was found during the examination. The pathoanatomical study confirmed the diagnosis of bone metaplasia of the bladder wall, identifying nests of urothelial tumour adjacent to the urothelium. No report of similar cases has been found in the literature referring to the association of urothelial tumour and bone metaplasia of the bladder wall.