Understanding Melanoma: Treatment Options for Stage IV Melanoma 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 CT scan showing metastatic recurrence of melanotic schwannoma in the Download Scientific Diagram A para aortic malignant melanotic nerve sheath tumor mimicking a gastrointestinal stromal tumor: a rare case report and review of literature BMC Surgery Springer Nature Link