Improving our Understanding of the Management and Pathogenesis of Rare and Neglected Tumors of the Central and Peripheral Nervous System Frontiers Research Topic Frontiers Gastric and colonic metastases of malignant melanoma diagnosed during endoscopic evaluation of symptomatic anemia presenting as angina: a case report Malignant melanotic nerve sheath tumor with PRKAR1A, KMT2C and GNAQ mutations CT scan showing metastatic recurrence of melanotic schwannoma in the Download Scientific Diagram