MeningioMas constitute approximately 15%-20% of all intracranial neoplasms and are often associated with favorable clinical prognosis because of their benign histology. Because of the high survival rates associated with meningiomas, patients with meningiomas can expect increased functional capacity compared with patients harboring other brain tumors. Parameters such as the rate of survival, tumor recurrence, and progression, 8 as well as the quality of life 3,17 of these patients, have traditionally been used to assess outcomes after intracranial meningioma surgery. According to recommendations from current outcomes research programs, neuropsychological-cognitive parameters also need to be incorporated to comprehensively evaluate surgical outcomes.Although meningiomas are extraaxial tumors, cognitive decline may arise due to perilesional edema and mass obJective Current recommendations stress the need for cognitive parameters to be integrated in the evaluation of outcomes for intracranial meningioma surgery. The aim of this prospective study was to examine neurocognitive function in meningioma patients pre- and postoperatively. methods Patients with skull base (anterior and middle fossa) and convexity (anterior and posterior) meningiomas (n = 54) underwent neuropsychological examination prior to and 1 year after surgery. A control group (n = 52) of healthy volunteers matched for age, sex, and education underwent the same examination. Assessments included executive, memory, and motor functions with standardized testing. Patients with convexity meningiomas were clinically assessed for parietal association cortex functions. results All patients performed significantly worse (p < 0.05) in most neurocognitive domains than controls. The skull base group showed more disturbances in memory than the convexity group (p < 0.05). The anterior convexity group showed more deficits in executive function than the posterior convexity group, which presented with parietal association cortex deficits. Verbal deficits were more pronounced in the left hemisphere than in the right hemisphere. Patients with a large tumor (> 4 cm) had more severe neurocognitive deficits than those with a small tumor (< 4 cm). Postoperatively, patients showed no deterioration in neurocognitive function. Instead, significant improvement (p < 0.05) was observed in some executive, motor, and parietal association cortex functions. coNclusioNs According to the authors' findings, intracranial meningiomas may cause neurocognitive deficits in patients. Surgery does not cause a deterioration in cognitive function; instead, it may lead to improvements in some functions. Permanent neuropsychological postoperative deficits should be interpreted as tumor-induced rather than due to surgery.