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 .
Paracaval lipoma may be seen in up to 0.5% of CT examinations .
It may be seen in patients with cirrhosis .
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 .
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.
On imaging consider
- bland thrombus in the inferior vena cava
- tumor thrombus
- tumors of the inferior vena cava, e.g. leiomyosarcoma
- hepatozelluläres Karzinom
- Vena cava inferior Thrombose
- Kompression der Vena cava