Late onset metastatic melanoma arising from a medium sized congenital melanocytic naevus Indian Journal of Dermatology, Venereology and Leprology Decoding Melanoma Metastasis Intracranial Metastases: Spectrum of Mr Imaging Findings Eun Kyoung Lee, Eun Ja Lee, Mi Sung Kim, Hee Jin Park, No Hyuck Park, Sung Il Park, Yong Seok Lee, 2012 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