A complex anterior communicating artery aneurysm projecting into the sella turcica.

Intrasellar aneurysms are rare vascular lesions that typically present with symptoms of mass effect upon the pituitary gland and optic apparatus. Most arise from the internal carotid artery, while only a handful of case reports describe intrasellar aneurysms originating from the anterior communicating artery. The appropriate recognition and management of these lesions are critical to prevent irreversible neurological deficits and catastrophic hemorrhage. Here, we highlight a patient with an anterior communicating artery aneurysm projecting into the sella turcica, leading to hyponatremia, pituitary dysfunction, and chiasmal compression.