Huge supratentorial arachnoid cyst presenting as an orgasmic headache.

Headache related with sexual activity (HAS) is a rare benign headache disorder. HAS is classified into pre-orgasmic and orgasmic headache. Increased intracranial pressure secondary to a Valsalva maneuver during orgasm has been proposed as a possible mechanism for orgasmic headache. We report a patient presenting with orgasmic headache associated with large supratentorial arachnoid cyst.