A Rare Case of Aggressive Melanotic Schwannoma Occurred in Spinal Nerve of a 59 Year Old Male Pathology Outlines Malignant melanotic nerve sheath tumor A Rare Case of Aggressive Melanotic Schwannoma Occurred in Spinal Nerve of a 59 Year Old Male 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 Metastatic Tumors (Chapter 22) Placental and Gestational Pathology