Fig 8.

Right HFS caused by an AICA loop in a 60-year-old man. Fusion of 3D T2 and TOF angiography sequences (0.6-mm thin sections; A, axial; B and C, coronal sections). Axial oblique reformatted T2-weighted image along the cisternal CN VII (D). Coronal oblique reformatted contrast-enhanced T1-weighted image (E). Note contact between an AICA loop and the presumed TZ of CN VII (white arrows), which is slightly indented. There is a second contact between the AICA and the more distal CN VII (arrowheads). Black arrows point to CN VII. NVCS due to the AICA loop impinging on the TZ was confirmed surgically. After the operation, symptoms disappeared.