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. Metastatic melanoma Malignant melanotic nerve sheath tumors in the spinal canal of psammomatous and non psammomatous type: Two case reports After the immune system destroys melanoma tumors, visible melanin can be left behind. We tracked tumoral melanosis in a case series of patients on immunotherapy and offer suggestions for how to monitor 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