Metastatic melanoma Stock Image C056 0518 Science Photo Library Rare malignant melanotic nerve sheath tumors of the upper limb nerves: utility of high frequency ultrasonography in preoperative imaging Skeletal Radiology Springer Nature Link Intracranial metastatic melanoma Radiology Reference Article Radiopaedia.org 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 with PRKAR1A, KMT2C and GNAQ mutations