Melanosis of the duodenal mucosa.
D001706:Biopsy; D004378:Duodenal Diseases / Q000150:complications / Q000175:diagnosis*; D004724:Endoscopy; D005921:Glomerulonephritis / Q000150:complications; D006801:Humans; D008297:Male; D008548:Melanosis / Q000150:complications / Q000175:diagnosis*; D008875:Middle Aged