Brain metastasis and intracranial leptomeningeal metastasis from malignant peripheral nerve sheath tumors: illustrative cases in: Journal of Neurosurgery: Case Lessons Volume 6 Issue 3 (2023) Journals Metastatic Melanoma of the Gallbladder ACS Improving our Understanding of the Management and Pathogenesis of Rare and Neglected Tumors of the Central and Peripheral Nervous System Frontiers Research Topic Frontiers Cervical Malignant Melanotic Nerve Sheath Tumor with retained PRKAR1A expression and a clinically benign course: a case report and review of the literature Frontiers Case report: A rare case of massive peripheral nerve melanotic schwannoma and review of the literature