Psammomatous melanotic schwannoma a rare neck lump The Annals of The Royal College of Surgeons of England 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 Spotty skin pigmentation and multiple blue naevi as cutaneous markers for spinal melanotic schwannoma BMJ Case Reports Psammomatous Melanotic Schwannoma Frontiers Case report: A rare case of massive peripheral nerve melanotic schwannoma and review of the literature