Follow-up MRI reveals John McCain’s glioblastoma

Sen. John McCain has been diagnosed with glioblastoma, an aggressive form of cancer in brain tissue, after undergoing a follow-up MRI after a CT scan for double vision. The Arizona Republican underwent the imaging procedures at the Mayo Clinic Hospital in Phoenix.

McCain underwent surgery to remove a blood clot behind his eye last week. Before the procedure, his neurological exam was normal, according to his physician.

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