Click on the masses of tumor in the image of bladder above:

This bladder was removed surgically from a male who had a long history of smoking. He had presented with hematuria. The opened bladder reveals masses of a neoplasm that histologically proved to be urothelial carcinoma (previously known as a transitional cell carcinoma). Urothelial carcinoma can arise anywhere in the urothelium lining the urinary tract from the urethra to the calyces, but is most common in bladder. Urothelial carcinoma is often multifocal and has a tendency to recur.