Growth associated protein 43 in differentiating peripheral nerve sheath tumors from other non neural spindle cell neoplasms Modern Pathology Rare malignant melanotic nerve sheath tumors of the upper limb nerves: utility of high frequency ultrasonography in preoperative imaging Skeletal Radiology Springer Nature Link Improving our Understanding of the Management and Pathogenesis of Rare and Neglected Tumors of the Central and Peripheral Nervous System Frontiers Research Topic Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non psammomatous type: Two case reports