Primary amyloidosis of the bladder mimicking probable malignancy: A case report.

Primary amyloidosis of the bladder is a rare clinical occurrence, with only a limited number of cases documented in literature thus far. Herein, is the presentation of a case involving a 75 year old male who presented with painless gross hematuria. Subsequent laboratory results and imaging completed were misleading, creating a high suspicion for bladder malignancy. Further workup revealed bladder biopsies to have positive apple-green birefringence with Congo-red immunostaining, diagnostic of amyloidosis.