The use of point-of-care ultrasonography (POCUS) is becoming increasingly widespread and clinically important. Here, we report a case in which the use of POCUS in the operating room identified a previously undiagnosed bilateral subclavian artery stenosis. A 70-year-old woman with a diagnosis of meningioma was scheduled to undergo a craniotomy. After the induction of general anesthesia, an abnormal radial artery waveform was observed bilaterally. A blood flow deficiency in both upper extremities

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... was suspected, and POCUS was immediately performed. Using POCUS, the anesthesiologist identified stenosis and hypoplasia of the bilateral subclavian arteries, complete occlusion of the bilateral common carotid arteries, and remarkably dilated bilateral vertebral arteries. By identifying these vascular abnormalities with POCUS, the anesthesiologist was able to adjust the patient's perioperative circulatory management and lead to a positive postoperative outcome.