Metastatic balloon cell melanoma A rare differential in the diagnosis of clear cell tumors 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 Intracranial metastatic melanoma Radiology Reference Article Radiopaedia.org Malignant melanotic nerve sheath tumor Radiology Reference Article Radiopaedia.org 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