Legend Axial CT images demonstrate a round, slightly hyperdense, focus just anterior to the pons. There is ventricular dilatation consistent with hydrocephalus.

Legend Axial images more superiorly demonstrate blood layering in the ventricular atrium.

Legend Lateral and AP images from a left vertebral artery angiogram demonstrate two saccular basilar tip aneurysms with some adjacent vasospasm. Key words: vascular angiography

Brain Diagnosis: Subarachnoid hemorrhage due to bilobed basilar tip aneurysm