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Case Reports
. 2022 Aug 17:45:102193.
doi: 10.1016/j.eucr.2022.102193. eCollection 2022 Nov.

An extremely rare case of pseudomelanosis of the urinary bladder

M Duijn  1 , S L Croonen  2 , J A Van der Zee  1
Affiliations
Case Reports

An extremely rare case of pseudomelanosis of the urinary bladder

M Duijn et al. Urol Case Rep. .

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.

Keywords: Melanin; Melanin-like pigment; Melanosis; Pigmentation; Pseudomelanosis; Urinary bladder.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1
Fig. 1
Cytology with candida and a pigmented urothelial cell.
Fig. 2
Fig. 2
A and B. Multiple black and brown pigmented lesions in the bladder during surgery. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 3
Fig. 3
Histology with abundant pigment in the upper layers of the urothelium and several pigment laden macrophages in the lamina propria.
See this image and copyright information in PMC

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