Pararenal malignant melanotic nerve sheath tumour: a rare tumour in an unfamiliar location BMJ Case Reports Interosseous Malignant Melanotic Nerve Sheath Tumor of the Sacrum Treated With an Innovative Reconstruction Technique Cureus Psammomatous Melanotic Schwannoma DoveMed 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 Peripheral Nerve Sheath Tumors of the Orbit Springer Nature Link