[A case report of posttraumatic deep vein thrombosis of the lower limbs in a patient with factor V Leiden mutation and the congenital absence of the inferior vena cava].

The congenital absence of the inferior vena cava (AIVC) is a rare vessels' malformation which may predispose to the development of thrombosis. Although AIVC is very rare, its occurrence should be considered in young patients, under 40 years old, with deep vein thrombosis (DVT). We are describing a case of a young male with bilateral deep vein thrombosis, in whom we defined three risk factors for DVT--trauma, factor V Leiden and the absence of the inferior vena cava. It is worth to consider the occurrence of malformation of the inferior vena cava in the young patients with deep vein thrombosis even when the other obvious risk factors are present (trauma, factor V Leiden mutation). The clinical state and the diagnostic process are discussed.