Pituitary apoplexy caused by ruptured internal carotid artery aneurysm.

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Abstract
Background and Purpose —We report the first case of pituitary apoplexy caused by the rupture of an intracavernous carotid artery aneurysm embedded in a pituitary adenoma. Case Description —A 46-year-old man presented with clinical and CT findings typical of pituitary apoplexy. MRI showed an unusual flow-void protrusion into the intratumoral hematoma, which, however, was not diagnosed as a ruptured aneurysm until severe intraoperative bleeding occurred. Angiography after surgery revealed an intracavernous carotid artery aneurysm. Conclusions —The possible association of adenoma and aneurysmal rupture should be kept in mind when assessing any case of pituitary apoplexy.