Malignant Peripheral Nerve Sheath Tumor of The Orbital Region Arising from Pre Existing Benign Neurofibroma in An Adolescent Patient of Neurofibromatosis Type 1: A Case Report and Review of Literature European Journal The Pigmented Side of Nerve Sheaths: Malignant Melanotic Nerve Sheath Tumor Raduan Ahmed Franca, Rosa Maria Di Crescenzo, Lorenzo Ugga, Rosa Della Monica, Elena D'Avella, 2025 Brain metastases as primary manifestation of a melanocytic malignant peripheral nerve sheath tumor in a 60 year old man BMC Neurology Springer Nature Link Peripheral Nerve Sheath Tumors of the Orbit Springer Nature Link Frontiers Cervical Malignant Melanotic Nerve Sheath Tumor with retained PRKAR1A expression and a clinically benign course: a case report and review of the literature