Abstract
Intercostal artery pseudoaneurysm is an exceedingly rare complication seen after chest wall insult, either through trauma or operative procedures. We present a case of a 74-year-old man with mitral regurgitation and aortic stenosis who underwent aortic and mitral valve replacement via sternotomy. At the 1-month follow-up, a 1-cm pulsatile mass was noted adjacent to the left of the sternotomy in the sixth intercostal space. Concern for a pseudoaneurysm of the intercostal artery prompted evaluation with ultrasound, which demonstrated a pseudoaneurysm originating from an intercostal artery. This unusually located pseudoaneurysm was treated with ultrasound-guided thrombin injection with complete resolution.