Epithelioid malignant peripheral nerve sheath tumor Applied Radiology Improving our Understanding of the Management and Pathogenesis of Rare and Neglected Tumors of the Central and Peripheral Nervous System Frontiers Research Topic Diagnosis, Treatment and Survival of 65 Patients with Malignant Peripheral Nerve Sheath Tumors Anticancer Research Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non psammomatous type: Two case reports