Frontiers Cervical Malignant Melanotic Nerve Sheath Tumor with retained PRKAR1A expression and a clinically benign course: a case report and review of the literature The Multimodality Management of Malignant Peripheral Nerve Sheath Tumours Malignant Peripheral Nerve Sheath Tumor of the Thigh Invading the Superficial Femoral Artery, with Necrotic Lung Metastases as Presenting Symptoms 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