Anomalous Course of the Left Subclavian Artery Leading to Aneurysm Formation and Thoracic Outlet Syndrome – A Case Report

Subclavian artery aneurysm is rare. Anomalous course of the subclavian artery behind the middle scalene muscle in the neck resulting in aneurysm formation is unknown. We describe a case of left subclavian artery aneurysm where the artery passed behind the middle scalene muscle producing angulation with distal aneurysm formation. It produced a visible swelling in the neck; effort related symptoms of fatigue or pain in the left arm muscles. The preoperative work-up and surgical procedure are described.

Keywords: Anomalous course of the left subclavian artery, Aneurysm formation, Thoracic outlet syndrome