Metastatic Melanoma: Causes, Symptoms, and Treatment 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 Malignant melanotic nerve sheath tumor Radiology Reference Article Radiopaedia.org Metastatic balloon cell melanoma A rare differential in the diagnosis of clear cell tumors Intracranial Metastatic Melanoma