Psammomatous Melanotic Schwannoma Metastatic melanoma posing as periapical pathology: key features and learning points British Dental Journal malignant peripheral nerve sheath tumor pacs A para aortic malignant melanotic nerve sheath tumor mimicking a gastrointestinal stromal tumor: a rare case report and review of literature BMC Surgery Springer Nature Link Frontiers Case Report: Malignant peripheral nerve sheath tumor of the thoracic spine with postoperative recurrence and intracranial metastasisa review of the literature