FIG 2. Patient with a right middle cerebral artery aneurysm.

A, 3D-CTA (right anterior view) shows the connecting vein (white arrowhead) between the BVR (white arrow) and the SPS. The connecting vein lies in contact with the aneurysm (black arrowhead). A black arrow and double black arrows indicate the SSVs and right middle cerebral artery, respectively.

B, A microscopic operative photograph shows that the right sylvian fissure is opened by the pterional approach. Spatulas (Spat.) retract the right frontal and right temporal lobes. The connecting vein between the BVR and the SPS (white arrow) adheres strongly to the middle cerebral artery (black double arrows) and the aneurysm (black arrow). A black arrowhead indicates the SSVs.