FIGURE 5.
Imaging studies of another case of IPO. A 63-yr-old man presented with brainstem compression syndrome caused by BTVBJ-GFDA. He underwent the IPO with high-flow bypass (ECA-saphenous vein graft-PCA). A, Preoperative left vertebral angiogram revealing BTVBJ-GFDA. B, Preoperative T1-weighted MR image demonstrated significant brainstem compression by the aneurysm. C, Postoperative left vertebral artery angiograms showed disappearance of the BTVBJ-GFDA. D, An arrow is pointing at clips used for IPO. Postoperative right common carotid artery angiogram demonstrated patent ECA to PCA bypass. ECA, external carotid artery; PCA, posterior cerebral artery.