ABSTRACT
Four cases of giant or large paraclinoid aneurysms of the internal carotid artery successfully trapped after assessing blood flow using a flowmeter are presented. In all cases, the initial plan for clipping was changed to aneurysm trapping due to various reasons. The collateral blood flow was assessed using the flowmetry test, the original procedure of measuring volumetric blood flow in the middle cerebral artery using an ultrasonic flowmeter. We analyze the reasons for clipping refusal, the procedure of measuring blood flow, treatment outcomes, and catamnestic data. The risks of reconstructive surgeries involving the internal carotid artery are discussed and the literature data are analyzed. Conclusions. Ultrasonic flowmetry is a simple and safe method for intraoperative control over blood circulation, which may play the key role in complicated surgical cases.