Figure 2: Intraoperative cranial radiography during gasserian ganglion compression with balloon catheter: the retrosellar position of the inflated balloon in the gasserian cistern is visible; the balloon is inflated with iopamidol so that its classic “pear” shape is visible at the fluoroscopic control performed during the procedure. Black arrow: balloon inflated with iopamidol Short white arrow: sella turcica Long white arrow: 12 gauge needle guide crossing the foramen ovale