The educational program for the 83rd American Association of Neurological Surgeons (AANS) Annual Scientific Meeting will include the presentation of scientific data in general and subspecialty section sessions as oral presentations and electronic posters. Abstracts submitted for the 83rd AANS Annual Scientific Meeting are peer-reviewed and scored on scientific merit, originality and the relevancy to the field of neurosurgery. Although scientific data is important, the quality of the abstract is the primary determinant for acceptance by the Scientific Program Committee.