Experimental and Therapeutic Medicine 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 This was melanosis coli in a 75M with a long standing type 2 diabetes and chronic constipation in the form of heavily pigmented mucosa, resembling leopard skin, from the cecum through the ascending Stained Colon by "David M. Martin, Md Science Photo Library" Melanosis Coli El Atlas Gastrointestinal gastrointestinalatlas.com Distribution and clinical correlates of viral and host genotypes in Chinese patients with chronic hepatitis C virus infection Rao 2014 Journal of Gastroenterology and Hepatology Wiley Online Library