Loss of H3K27 trimethylation is not suitable for distinguishing malignant peripheral nerve sheath tumor from melanoma: a study of 387 cases including mimicking lesions Modern Pathology Malignant Peripheral Nerve Sheath Tumor (MPNST) Tumor Surgery Network Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non psammomatous type: Two case reports Malignant Peripheral Nerve Sheath Tumor grows in the soft tissues such as muscle, fat, tendons, ligaments, lymph and blood vessels, nerves, and other tissue that connects and supports the body. It also