Frontiers Mucosal Melanoma: Pathological Evolution, Pathway Dependency and Targeted Therapy Pathology Outlines Nevi general 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 Pathology Outlines Pigmented epithelioid melanocytoma Pathology Outlines Mucosal melanoma (genital, oral, sinonasal)