{Reference Type}: Case Reports {Title}: An extremely rare case of pseudomelanosis of the urinary bladder. {Author}: Duijn M;Croonen SL;Van der Zee JA;Duijn M;Croonen SL;Van der Zee JA; {Journal}: Urol Case Rep {Volume}: 45 {Issue}: 0 {Year}: Nov 2022 暂无{DOI}: 10.1016/j.eucr.2022.102193 {Abstract}: Pseudomelanosis (PM) is a rare, benign, condition that is characterized by deposition of melanin and/or melanin-like pigment in mucosal cells and macrophages and is best known as the entity pseudomelanosis coli. Pseudomelanosis primary of the urinary bladder has been reported only in a handful of cases worldwide. This article reports an extremely rare case of pseudomelanosis of the urinary bladder in a 79-year-old male with a history of macroscopic painless hematuria.