Fig 1.

A 72-year-old woman with subarachnoid hemorrhage.

A and B, Volume-rendered MDCTA images obtained with right anterior oblique (A) and lateral (B) projections demonstrate a bilobed aneurysm at the bifurcation of the right internal carotid artery (arrow). There are also 2 small aneurysms at the posterior communicating artery (long arrow) and the anterior choroidal artery (arrowhead). The anterior choroidal artery aneurysm was missed by reader 2 at initial interpretation.

C, The same aneurysms (arrows and an arrowhead) are also depicted on the lateral projection DSA image of the right internal carotid artery.