This document discusses different types of brain herniation seen on imaging. The most common types are subfalcine herniation and descending transtentorial herniation. Subfalcine herniation occurs when one hemisphere pushes across the midline under the falx cerebri. Descending transtentorial herniation occurs when the temporal lobe and hippocampus herniate through the tentorial incisura. Other types discussed include tonsillar herniation, ascending transtentorial herniation, and rare transdural herniations. Complications of herniations include hydrocephalus, nerve compression, and infarcts.