paracaval lipoma

Paracaval lipoma (a.k.a. juxtacaval fat collection or pseudolipoma of the inferior vena cava) is the apparent protrusion of paracaval fat into the inferior vena cava (IVC) and is commonly visible on CT; some believe it to be a normal anatomic variant .

Epidemiology

Paracaval lipoma may be seen in up to 0.5% of CT examinations .

Associations

It may be seen in patients with cirrhosis .

Pathology

The paracaval lipoma appearance is thought to be due to volume averaging through inwards and upwards indrawing of the posteromedial wall of the inferior vena cava as a result of negative pressure created within the thorax on inspiration .

Radiographic findings

CT

Paracaval lipoma occurs at the medial aspect of the intrahepatic portion of the inferior vena cava (IVC) above the caudate lobe and represents pericaval fat appearing to invaginate into the inferior vena cava.

Differential diagnosis

On imaging consider