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 Melanotic schwannoma mimicking metastatic pigmented melanoma: a pitfall in cytological diagnosis Understanding Melanoma: Treatment Options for Stage IV Melanoma Diffuse melanosis cutis: a rare manifestation of metastatic melanoma BMJ Case Reports A para aortic malignant melanotic nerve sheath tumor mimicking a gastrointestinal stromal tumor: a rare case report and review of literature BMC Surgery Springer Nature Link Intracranial metastatic melanoma Radiology Reference Article Radiopaedia.org