Spinal intramedullary schwannomasreport of a case and extensive review of the literature Neurosurgical Review Springer Nature Link Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non psammomatous type: Two case reports Melanotic Schwannoma Basicmedical Key Intradural and Intramedullary Melanotic Schwannoma of the Lumbar Spine, After Spinal Anesthesia A case report Schwannoma Radiology Reference Article Radiopaedia.org Malignant melanotic schwannoma of the cervical spinal cord: a case report BMC Neurology Springer Nature Link