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Inferior vena cava

The inferior vena cava (IVC) is the largest vein in the body, formed by the union of the left and right common iliac veins at the level of L5. It ascends through the retroperitoneum on the right side of the vertebral column, passes through the diaphragm at the caval opening (T8), and enters the right atrium of the heart.

The IVC collects deoxygenated blood from the lower limbs, pelvis, and abdomen, returning it to the heart. Along its course, it receives numerous tributaries, including the renal veins, hepatic veins, lumbar veins, gonadal veins, and right adrenal vein.

Clinically, the IVC is significant for conditions such as deep vein thrombosis (DVT) propagation, pulmonary embolism, Budd-Chiari syndrome, IVC thrombosis, and congenital anomalies (e.g., duplicated IVC). It is also a major site for IVC filter placement in patients at risk of pulmonary embolism.

Synonyms

  • IVC

  • Posterior vena cava

  • Vena cava inferior

Function

  • Drains deoxygenated blood from the lower body into the right atrium

  • Serves as the main venous conduit for abdominal and pelvic viscera

  • Plays a key role in venous return and preload maintenance for cardiac output

  • Provides access route for central venous catheters, filters, and interventional procedures

Tributaries

  • Common iliac veins (left and right)

  • Lumbar veins

  • Right gonadal vein and right adrenal vein

  • Renal veins

  • Hepatic veins

MRI Appearance

T1-weighted images:

  • Flowing blood appears as a signal void (black lumen)

  • Vessel wall hypointense; surrounding retroperitoneal fat is hyperintense, providing contrast

T2-weighted images:

  • Lumen also appears as a signal void due to venous flow

  • Thrombus within the IVC may appear intermediate to high signal depending on age of clot

STIR (Short Tau Inversion Recovery):

  • Fat suppression improves visualization of the IVC against retroperitoneal fat

  • Thrombosis or perivascular edema appears hyperintense

T1 Post-Contrast (Gadolinium-enhanced MRI):

  • IVC lumen enhances brightly and homogeneously

  • Thrombus or filling defects appear as non-enhancing intraluminal regions

  • Useful for detecting IVC obstruction, tumor thrombus (e.g., renal cell carcinoma extension), or venous anomalies

MRA (Magnetic Resonance Angiography):

  • Contrast-enhanced MRA provides high-resolution 3D visualization of the IVC, iliac veins, renal veins, and hepatic veins

  • Identifies stenosis, thrombosis, occlusion, duplication, or extrinsic compression

  • Ideal for preoperative venous mapping and filter planning

CT Appearance

Contrast-Enhanced CT (CT Angiography, CTV):

  • IVC lumen opacifies brightly with intravenous contrast

  • Clearly demonstrates course, caliber, tributaries, and pathologies

  • Detects thrombus, tumor invasion (e.g., renal or hepatic carcinoma), stenosis, compression, and anomalies

  • Multiplanar and 3D reconstructions provide detailed mapping for interventional radiology and surgical planning

  • Gold standard for IVC filter evaluation, oncologic staging, and venous obstruction assessment

CT images

Inferior vena cava CT axial image -img-00000-00000

MRI images

Inferior vena cava CT axial image -img-00000-00000_00001

MRI images

Inferior vena cava MRI axial image -img-00000-00000