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Malignant Melanoma Metastatic to Oligodendroglioma: Case Report and Literature Review of Tumor-to-Tumor Metastasis to Gliomas.

Tumor-to-tumor metastasis is an uncommon phenomenon, and a metastasis from an extracranial donor tumor to an intracranial recipient tumor is extremely rare. In particular, there are only 14 cases reported in the literature that describe a tumor-to-tumor metastasis involving a glioma. We present a rare case of an 83-year-old man with an 11-year history of lentigo maligna melanoma who presented with impaired balance and cognitive slowing and was found to have rapid progression of a previously known indolent right frontal brain mass. Pathologic examination of the tumor after resection revealed the presence of both malignant melanoma and an oligodendroglioma WHO grade II. To the best of our knowledge, this is the first reported case of malignant melanoma metastasizing to an oligodendroglioma that has been confirmed by immunohistochemistry and genetic analysis.

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