Metastatic Melanoma of the Gallbladder ACS Metastatic melanoma Stock Image C056 0518 Science Photo Library Amelanotic Malignant Melanoma: A Case Report Cureus 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