Malignant melanotic nerve sheath tumor with PRKAR1A, KMT2C and GNAQ mutations Eruptive melanocytic nevi heralding the diagnosis of metastatic malignant melanoma: A case report ScienceDirect Intracranial metastatic melanoma Radiology Reference Article 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