A para aortic malignant melanotic nerve sheath tumor mimicking a gastrointestinal stromal tumor: a rare case report and review of literature BMC Surgery Springer Nature Link EPOS Brain metastases as primary manifestation of a melanocytic malignant peripheral nerve sheath tumor in a 60 year old man BMC Neurology Springer Nature Link Melanoma Metastases versus Neurocysticercosis; the Importance of Correct Interpretation of MR Findings Clinical Case Reports Journal (ISSN 2767 0007)