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: Anlotinib combined with radiotherapy achieves sustained disease control in advanced malignant melanotic nerve sheath tumor Huge epithelioid malignant peripheral nerve sheath tumor in the left axilla : r MedicalGore Malignant Peripheral Nerve Sheath Tumors: Latest Concepts in Disease Pathogenesis and Clinical Management Malignant Peripheral Nerve Sheath Tumors Springer Nature Link Pathology Outlines Malignant melanotic nerve sheath tumor