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Postoperative mediastinal masses. Report of two cases.

A mediastinal mass can mimic the presence of cardiovascular disease by simulating cardiac or vascular enlargement on chest radiographs, or by compressing the heart or great vessels with resulting symptoms or signs. This problem of misdiagnosis is particularly acute in patients with prior cardiac surgery for repair of congenital heart lesions. Two such cases are reported. In addition tosimulating cardiac disease, at least one, and perhaps both, were related to prior mediastinal surgery.