Metastatic Melanoma: Symptoms, Stages, Treatment Malignant melanotic nerve sheath tumor Radiology Reference Article Radiopaedia.org Metastatic Malignant Melanoma Pathology Outlines Malignant melanotic nerve sheath tumor 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