Transitional cell carcinoma of bladder. This CT shows a polypoid soft tissue mass protruding into the lumen of the urinary bladder, in this patient who presented with haematuria. Although we cannot differentiate between the different histological types of bladder tumour based on this appearance alone, TCC is by far the most common form of bladder cancer. Squamous cell carcinoma of the bladder is rare; often we can suggest it as a possibility as it is predisposed to by chronic abnormalities of the bladder such as Schistosomiasis infection, a neurogenic bladder or bladder calculi. Adenocarcinoma is extremely rare, and often occurs as a consequence of a urachal remnant, which means that it will be located in the anterior aspect of the bladder, in the midline.