Metastatic melanoma presenting as a malignant peripheral nerve sheath tumour MedCrave online Frontiers Cervical Malignant Melanotic Nerve Sheath Tumor with retained PRKAR1A expression and a clinically benign course: a case report and review of the literature Improving our Understanding of the Management and Pathogenesis of Rare and Neglected Tumors of the Central and Peripheral Nervous System Frontiers Research Topic Malignant Melanotic Nerve Sheath Tumor American Journal of Neuroradiology Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non psammomatous type: Two case reports