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 MicroRNAs in the Pathogenesis, Prognostication and Prediction of Treatment Resistance in Soft Tissue Sarcomas Malignant Peripheral Nerve Sheath Tumor of the Thigh Invading the Superficial Femoral Artery, with Necrotic Lung Metastases as Presenting Symptoms Malignant Melanotic Nerve Sheath Tumor of the Neck: A Case Report Applied Radiation Oncology