Which of the following tumor types is the most common neoplastic process to affect the brain?

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Metastasis is the most common neoplastic process to affect the brain. In fact, approximately 10 times more common than primary brain tumors. Metastatic tumors often arise from lung, breast, and skin cancers, but can come from a variety of other sources as well. Gliomas (B) are a type of primary brain tumor, meningiomas (C) are another type of primary brain tumor, and pituitary adenomas (D) are usually benign tumors that affect the pituitary gland, which is located at the base of the brain. While these other types of tumors can certainly occur in the brain, they are not as common as metastases.

Which of the Following Tumor Types Is the Most Common