<unk>  is rare. Even in people with a known<unk>  tumor, only 0.6–10% experience<unk> ; the risk is higher in larger tumors. Based on extrapolations from existing data, one would expect 18 cases of<unk>  per one million people every year; the actual figure is probably lower. The average age at onset is 50; cases have reported in people between 15 and 90 years old. Men are affected more commonly than women, with a male-to-female ratio of 1.6. The majority of the underlying tumors are "null cell" or nonsecretory tumors, which do not produce excessive amounts of hormones; this might explain why the tumor has often gone undetected prior to an episode of<unk> .
Pituitary apoplexy
Empty sella syndrome
Neuroleptic malignant syndrome
Oculogyric crisis
Watershed stroke
Exploding head syndrome
Oculocerebrorenal syndrome
Transient ischemic attack