Melanoma metastasis Radiology Case Radiopaedia.org 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 Inflammation lights the way to metastasis Nature Frontiers Case report: Exceptional disease progression in a 70 year old patient: generalized melanosis and melanuria in the course of metastatic melanoma a case study