How often do chronic extra-cerebral haematomas occur in patients with intracranial arachnoid cysts?

Abstract

As also reflected in a literature review, intracranial chronic haematomas occur most frequently as a complication of middle fossa cysts. Possible mechanisms behind the formation of haematomas, and the strong associations with temporal fossa cysts, are discussed, with emphasis on the loose attachment of the membrane of the arachnoid cyst to the dura in the middle fossa, and its possible role as an "extra wall" covering easy-bleeding vascular structures in the dura.