case_images: PMC11791333_01
case_images: Gross imaging from cystoscopic examination of the posterior bladder wall significant for abnormal appearing black and velvety urothelial mucosa.
case_images: gr1.jpg
case_images: PMC11791333_01_gr1.jpg
case_images: fig1
case_images: Diffuse hyperpigmentation was seen on the bladder mucosa, but it was most notable on the posterior bladder wall, appearing black and velvety (Fig. 1).
case_images: A. Microphotograph shows surface urothelium (i.e., urothelial mucosa) with intracytoplasmic dark brown to black pigments (Hematoxylin and eosin (H&E) stain; 400x magnification). B. Subsequent microphotograph shows the disappearance of intracytoplasmic pigment granules following bleach treatment for melanin (H&E stain; 400x magnification).
case_images: gr2.jpg
case_images: PMC11791333_01_gr2.jpg
case_images: fig2
case_images: Two tan-pink soft tissue samples measuring 0.3 cm and 0.4 cm were sent for pathologic analysis (Fig. 2).