Primary amyloidosis of urinary bladder and ureter: cause of mural calcification.

Primary amyloidosis is seen in the absence of predisposing disease. It may affect most organs in the body, including the collecting system of the urinary tract. Submucosal calcifications have been described in the renal pelvis and may be pathognomonic for primary amyloidosis of the renal pelvis. We have been able to demonstrate similar submucosal calcifications in the ureter and bladder. The differential diagnosis of submucosal calcification of the distal ureter and bladder must include bilharziasis and tuberculosis. With the recognition of submucosal calcifications, diagnosis of the underlying disease may be readily made. An illustrative case is presented.