Inferior Vena Cava: Function, Anatomy, and Clinical Importance

The inferior vena cava (IVC) is the largest vein in the body. It returns deoxygenated blood from the lower body (below the diaphragm) to the right atrium of the heart.

Anatomy

• Formation: Union of the left and right common iliac veins at ~L5 vertebral level.
• Course: Ascends retroperitoneally along the right side of the vertebral column, pierces the diaphragm at the caval opening (T8), enters the right atrium.
• Tributaries: Lumbar, renal, right gonadal (testicular/ovarian), hepatic, phrenic, adrenal veins.

Clinical Significance

• IVC obstruction (thrombosis, compression by tumor, pregnancy) causes lower extremity edema, venous insufficiency.
• IVC filters are placed to prevent pulmonary embolism.
• Central venous pressure (CVP) is often measured via IVC ultrasound.