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 Global epidemiology of hepatitis C virus infection: An up date of the distribution and circulation of hepatitis C virus genotypes 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 Wikipedia