Worsening Headache and Ataxia: Your Dx?

With this tumor, the most frequent complaints are headaches and ataxia; a third of patients have associated cranial nerve palsies and long tract dysfunction. Your dx?

A 39-year-old woman presented with a 2-month history of progressively worsening headache and right-sided ataxia. Neurologic examination revealed mild dysmetria, and dysdiadochokinesia on the right side. MRI of the brain was obtained.