[Accessory cervical rib as a cause of arterial thoracic outlet syndrome (clinical case)].

The article presents a clinical observation of successful treatment of a patient with post-thrombotic occlusion of the subclavian artery and critical ischemia of the left upper limb. According to computed tomography angiography, extravasal compression of segment 2 of the subclavian artery by an additional cervical rib was detected. Decompression of the subclavian artery with resection of the additional cervical rib, thrombectomy, and angiography were urgently performed via the left supraclavicular approach. Blood flow to the limb was restored, and no additional endovascular procedures were required. Regression of the clinical picture of critical ischemia was noted in the postoperative period.