Surgical Treatment of Peripheral Neuropathic Pain, Peripheral Nerve Tumors, and Peripheral Nerve Injury Frontiers Research Topic Intracranial metastasis from a malignant peripheral nerve sheath tumor in a patient with neurofibromatosis type 1: A case study and literature review ScienceDirect Weak Spot of Metastatic Melanoma Cells Identified Inside Precision Medicine An 84 year old man with a history of metastatic melanoma of the scalp who was undergoing immunotherapy presented with new, multiple blue gray macules on the scalp.