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CT Concepts

Imaging Diagnosis: Azygous Continuation of the Caudal Vena Cava with and without Portocaval Shunting

Anthony J. Fischetti J.K.

Veterinary Radiology & Ultrasound, 2008. 49(6): p.573-576.

The CT angiographic features of azygous continuation of an interrupted caudal vena cava in dogs with and without portocaval shunting are described. Azygous continuation of a discontinuous caudal vena cava is usually an incidental finding, not associated with portosystemic shunting. Identification of an associated portosystemic shunt will determine the need for surgical intervention. CT angiography provides a means for making this distinction and details the course and size of the anomalous vessels. Focal widening of the caudal vena cava on a VD thoracic radiograph should raise suspicion for azygous vein distension.