[Clinical and paraclinical identification by various imaging technics of congenital anomalies of the inferior vena cava (apropos of 4 cases)].

Four cases of anomalies of the inferior vena cava (IVC) were studied by two noninvasive imaging techniques: real-time ultrasonography and computed tomography. These techniques were used alone in 1 case of left IVC to determine the diagnosis. The other 3 cases were studied initially by phlebography: left IVC with iliac phlebitis; double IVC, also with iliac phlebitis, and a special case in which it was not clear whether the diagnosis was agenesis of the IVC or postnatal caval thrombosis. The two patients with recent iliac vein thrombosis were treated by heparin, but the other two received no particular therapy. Concerning these 4 cases, the authors speak of the known complexity of embryogenesis of the IVC which accounts for the great diversity in its anomalies. Left and double IVC are among the most frequent anomalies along with periaortic venous rings and the ureter behind the IVC. These anomalies are most often asymptomatic, but an understanding of them is essential for correct interpretation of the results of different imaging techniques and for effective performance of surgical and medical acts concerning the IVC directly or indirectly. For diagnosis of IVC anomalies, iliac venacavography, when not performed initially, can in certain cases be replaced by routine noninvasive imaging techniques, to which may now be added magnetic resonance imaging.