Fig. 1.
a Noncontrast CT scan showing a hyperdense basilar artery. b CTA showing an intraluminal basilar thrombus. c CTA reconstruction showing a fusiform basilar aneurysm. d Brain magnetic diffusion-weighted resonance imaging showing an acute pontine infarction. e, f Noncontrast CT scans showing a diffuse subarachnoid hemorrhage (Fisher grade 3).