Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non psammomatous type: Two case reports Metastatic Multifocal Malignant Peripheral Nerve Sheath Tumour in the Cervicothoracic Spinal Cord of a Dog Initially Mimicking Meningomyelitis Genomic Landscape of Superficial Malignant Peripheral Nerve Sheath Tumor Laboratory Investigation Update on Peripheral Nervous System Tumors: Lesions with Epithelioid and Melanotic Features ScienceDirect Pathology Outlines Malignant melanotic nerve sheath tumor Malignant Peripheral Nerve Sheath Tumor (MPNST)