Legend Axial non-contrast CT images through the skull base demonstrate high density material in the basal cisterns, consistent with subarachnoid hemorrhage. The fourth ventricle is also filled with acute blood. The temporal horns of the lateral ventricles are dilated.

Legend CT angiography images and surface-shaded reconstructions demonstrate a wide-necked aneurysm at the left vertebrobasilar junction. Key words: cta ct vascular aneurysm hemorrhage

Brain Diagnosis: Subarachnoid hemorrhage Basilar aneurysm