Diagnosis of aneurysm of the thoracic aorta. Comparison between two non invasive techniques: two-dimensional echocardiography and computed tomography

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Abstract
In order to assess the respective values of two-dimensional echocardiography (2D echo) and computed tomography (CT) in the evaluation of aneurysms of the thoracic aorta, 14 patients with angiographically proven aneurysms of the thoracic aorta (three of which were dissecting aneurysms) were studied. The entire thoracic aorta was visualized in 10/14 patients by 2D Echo and in all patients by CT. An intimal flap was recognized by 2D echo in each case with a dissection whereas such a recognition was never possible with CT. CT identified calcification of the wall of an huge aneurysm of the ascending aorta in one case and a thrombotic stratification in the lumen of the descending thoracic aorta in another case; both abnormalities were missed by echocardiography probably because of inappropriate gain setting. In conclusion, 2D Echo and CT are both useful in the evaluation of aneurysms of the thoracic aorta: 2D echo appears to be superior in the recognition of an intimal flap due to dissection whereas CT allows a better recognition of the configuration, extension and tissue modifications of the aneurysm.

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