ABSTRACT

Arachnoid cysts are collections of cerebrospinal fluid within the arachnoid membrane. They are benign, congenital lesions, and are usually asymptomatic. Rarely, they may become acutely symptomatic, due to cyst enlargement, subdural or the presence of the intracystic hemorrhage. Intracranial arachnoid cyst associated with subdural hematoma is an uncommon after minor head trauma or spontaneous. The damage to the bridging veins within the cyst, or on the wall of the cyst, is thought to be a source of possible bleeding. We report here the case of a 29-year-old man who, after a minor head injury, developed subacute subdural hematoma associated with an underlying arachnoid cyst. It is important to keep in mind that arachnoid cysts can be associated with subdural hematomas.