The incidence of post-sternotomy mediastinitis is 1 to 5% but the mortality is about 40%. The formation of a pseudo-aneurysm is a rare complication and an infectious origin is exceptionally rare. Diagnosis must be early because of the risk of rupture. In this case, a 47 year old patient developed slowly progressive mediastinitis presenting with a pseudo-aneurysm of the aorta. Surgery comprised a retrosternal transposition of the greater omentum.
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