This is a very rare case of metastatic oral mucosal melanoma to the colon with an unusual presentation mimicking melanosis coli. The colonoscopy findings show no mass effect but multiple hyperpigmented lesions Hepacivirus C Encyclopedia MDPI Quantitative Analysis of Melanosis Coli Colonic Mucosa Using Textural Patterns This is a very rare case of metastatic oral mucosal melanoma to the colon with an unusual presentation mimicking melanosis coli. The colonoscopy findings show no mass effect but multiple hyperpigmented lesions Melanosis coli: a disappearing act Gastrointestinal Endoscopy Melanosis coli Wikipedia