[Deep venous thrombosis as a complication of a congenital abnormality of the inferior vena cava]. / Dyb thrombophlebitis som komplikation til medfødt karanomali i vena cava inferior gebetet.

The case of an 18-year old man with deep venous thrombosis as a complication of a congenital anomaly of the vena cava inferior is presented. The relevant diagnostic procedures are discussed. It is recommended to screen young patients with idiopathic deep venous thrombosis (DVT) for anomalies of the vessels of the vena cava inferior system. The screening can be done by ultrasound scanning, if necessary followed by cavography or CT-scanning. Other reasons for idiopathic DVT are discussed. It is recommended to screen for cancer, coagulopathy and antiphospholipid antibody. If DVT is found on the basis of congenital anomaly of the vena cava inferior, it is recommended to start life long-term anticoagulant therapy.