Abstract
Detailed knowledge of the anatomy of the midbrain is important for the surgery. The midbrain is composed of the cerebral peduncles, the tegmentum, and the tectum. The ventral midbrain and the cerebral peduncles can be reached through the transsylvian approach or the orbitozygomatic approach. The ventrolateral midbrain and the tegmentum can be reached through the extreme lateral supracerebellar infratentorial approach or the subtemporal approach. The dorsal midbrain and the tectum can be reached through either the occipital transtentorial approach or the infratentorial supracerebellar approach. To minimize surgical morbidity, it is very important to choose the best entry point for the resection.
