Melan Dx: a knowledge enhanced vision language framework improves differential diagnosis of melanocytic neoplasm pathology npj Digital Medicine Staging Melanocytic Skin Neoplasms Using High Level Pixel Based Features GASTROINTESTINAL HEMORRHAGE (2): Melena. Melena, the passage of black, tarry stools, usually implies blood loss greater than 500 ml originating anywhere between the oropharynx and the right hemicolon. Melena occurs most often, Figure 2 from Smokers' melanosis in a Nigerian population: Melanotic refers to MELANIN not MELENA #medicine #doctor #humor #doctorsofinstagram #medreels #melanin