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(A) Preoperative computed tomography (CT) scans during the Valsalva maneuver, showing the nasopharyngeal end of the Eustachian tube (arrowheads). (B) Six-month postoperative CT scans during the Valsalva maneuver, showing patency of the cartilaginous Eustachian tube (arrows). (C) Six-month postoperative CT scans without the Valsalva maneuver. No micro-fracture was found along the bony canal of the internal carotid artery (asterisks).
