What is Metastatic Melanoma? Forefront Dermatology 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 Weak Spot of Metastatic Melanoma Cells Identified Inside Precision Medicine Intracranial metastasis from a malignant peripheral nerve sheath tumor in a patient with neurofibromatosis type 1: A case study and literature review ScienceDirect