Recurrent metastatic malignant peripheral nerve sheath tumor associated with neurofibromatosis I: a rare case with atypical immunohistochemistry Anais Brasileiros de Dermatologia Frontiers Cervical Malignant Melanotic Nerve Sheath Tumor with retained PRKAR1A expression and a clinically benign course: a case report and review of the literature Pathology Outlines Malignant melanotic nerve sheath tumor Brain metastases as primary manifestation of a melanocytic malignant peripheral nerve sheath tumor in a 60 year old man BMC Neurology Springer Nature Link