Primary bladder amyloidosis mimicking bladder cancer complicated by bladder rupture: A case report

Amyloidosis is related to the extracellular deposition of abnormal protein fibrils in various tissues. It can be either localized to an organ or generalized, affecting multiple systems. Amyloidosis of the urinary bladder is a rare histopathological finding. It is clinically interesting that such cases' clinical, radiological, and even endoscopic presentation mimic urothelial carcinoma to a great extent. Here, we discuss a case of a 49‐year‐old gentleman who presented with frank painless hematuria. The patient was diagnosed with a bladder mass suspicious of malignancy depending on the clinical presentation aided by the cystoscopic and radiological evaluation. Histopathologic samples of the transurethral resection of the mass proved to be primary bladder amyloidosis. This case is of unique clinical interest in that it is the first case reported of bladder amyloidosis that is complicated by extraperitoneal bladder rupture post‐operatively. However, no immediate intraoperative perforation to the bladder wall during resection was evidenced.
Primary urinary bladder amyloidosis is a rare histopathological finding. Interestingly, it presents clinically and radiologically similar to urothelial carcinoma of the bladder. The only differentiation can be reached by histopathologic examination. Resection of such bladder lesions requires special care as such flat pathological lesions can be complicated by bladder perforation.