FIG 4. A 55-year-old woman with petroclival meningioma.

A, Axial contrast-enhanced T1-weigted image reveals a mass at the right petroclival region.

B, 3D-CT angiography showing the tumor and its adjacent vessels.

C-D, The fused 3D-CT image (C) demonstrates encasement of the superior cerebellar artery (arrows) by the tumor, which was consistent with the surgical finding (D).

E-F, The fused 3D-CT image (F) clearly demonstrates the feeding artery arising from the meningohypohyseal artery which is not visualized on 3D-CT angiography (E).