Nontraumatic Intracystic Hemorrhage of Arachnoid Cyst: CT and MR Findings

Abstract

Arachnoid cysts (AC) are cerebrospinal fluid collections surrounded by an arachnoid membrane. They are mostly of developmental anomalies and represent 1% of all intracranial space-occupying lesions (1). Although ACs are usually asymptomatic, they may present clinical symptoms by complications such as rupture with subdural hematoma, intracystic hemorrhage, and acute cyst expansion (2). ACs with intracystic hemorrhage in the absence of head trauma are extremely rare. In this paper, we present a case of hemorrhagic AC, and also performed a relevant literature review on this disease.