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[Contribution of scanning to the diagnosis and evaluation of acquired anomalies of the aorta (author's transl)].

Acquired anomalies of the aorta represent at the present time an excellent indication for scanning in vascular diseases. This form of examination permits perfect visualization of aneurysms, wherever they are located, frequently enabling a tumour in the vicinity of the aorta to be eliminated. It provides an exact topographic picture of the lesions with a quantitative indication of their height. The detection of a peri-aortic hematoma facilitates the diagnosis of cracking of the aneurysm. Scanning has a far from negligible contribution to make to the diagnosis of aortic dissections. The visualization of intraluminal calcifications at a distance from the wall, of a floating membrane or a false channel provides confirmation of the diagnosis and suggests the possibility of an angiography. As an additional bonus in the case of acute ischaemia of the lower limbs, scanning permits an easy and inexpensive diagnosis of a complete thrombosis of the aorta and an indication of its extent. Computerised scanning as a non-invasive and easily repeated examination, has numerous and widely varying indications in the pathology of the aorta. Its potential contribution in certain cases appears to be so great as to envisage its delaying angiography.