Giant basilar artery aneurysm
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Non contrast study: a mass of heterogeneous attenuation is observed with a tubular aspect and well defined, that presents with compressive effect on the brain stem and third ventricle. There is supratentorial ventricular dilatation (hydrocephalus).
Contrast phases confirmed that it was a tortuous basilar artery, elongated and with a important thrombosed aneurysmal dilatation.
The basilar artery is part of the posterior cerebral circulation. The basilar artery arises from the confluence of the left and right vertebral arteries at the base of the pons as they rise towards the base of the brain.