Introduction The most common primary CNS neoplasm. Slow growing and benign. Presentation Headache awakening patient at night or worse in morning. Elevated ICP leads to: nausea / vomit papilledema Cushing's triad bradycardia HTN Cheyne-Stokes respiration Focal deficits fixed dilated pupil common (CN III) Evaluation Biopsy is definative diagnosis. Clinical suspicion + CT / MRI can diagnose meningioma lymphoma prolactinoma The size and location of the meningioma dictates the clinical presentation Differential See list of neurologic tumors at left Treatment Surgical excision