Frontiers Rare giant retroperitoneal melanotic schwannoma: a case report and literature review Rare malignant melanotic nerve sheath tumors of the upper limb nerves: utility of high frequency ultrasonography in preoperative imaging Skeletal Radiology Springer Nature Link Pathology Outlines Malignant melanotic nerve sheath tumor Neurogenic Sarcoma (Malignant Peripheral Nerve Sheath Tumor) Basicmedical Key We are deeply saddened by the loss of Broadway star Gavin Creel. He passed away from Malignant melanotic nerve sheath tumor (MMNST) which is a rare form of Malignant peripheral nerve sheath Melanotic Neuroectodermal Tumor of Infancy