Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non psammomatous type: Two case reports What is Metastatic Melanoma? Forefront Dermatology 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. CT scan showing metastatic recurrence of melanotic schwannoma in the Download Scientific Diagram