Aneurysms of the subclavian artery in thoracic outlet syndrome

: The true subclavian artery aneurysm is a rare but dangerous complication of TOS. During a 20 years time period we observed 18 patients with subclavian artery aneurysms. 12 of these patients showed cervical ribs. Half of the patients (n = 9) presented with a critical ischemia of an upper extremity, nine patients were operated on electively. The acute ischemia makes the desobliteration of the outflow tract necessary first. The next step ist the transaxillary exarticulation of the first rib and the resection of the aneurysm. The reconstruction of the subclavian artery is performed by using autologous vein material or PTFE prostheses. In two cases both with an acute embolic critical ischemia major amputations were unavoidable. 13 patients could be reexamined in 1996: 11 bypasses proved to be functioning, 2 were definitely occluded.