Table 1 IVC aneurysm classification system
From: Multiple inferior vena cava aneurysms mimic a retroperitoneal tumor: a case report
| Gradman and Steinberg classification | Thompson and Lindenauer classification | |
|---|---|---|
| Type I | Aneurysms of the suprahepatic IVC without venous obstruction | Congenital aneurysm |
| Type II | Aneurysms associated with interruption of the IVC above or below the hepatic vein | Acquired aneurysm |
| Type III | Aneurysms confined to the infrarenal IVC without associated venous anomaly | Aneurysm secondary to arteriovenous fistula |
| Type IV | Miscellaneous |