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Diagnosis of a Porto-Azygous Shunt Using Helical Computed Tomography Angiography

Thompson M.S., Graham J.P. and Mariani C.L.

Vet Radiol Ultrasound, 2003. 44(3): p.287-91.

Congenital portosystemic shunts occur uncommonly in dogs. Conventional diagnostic methods either do not offer simultaneous diagnosis and anatomic characterization or require an invasive selective catheterization. Helical computed tomography (HCT) is a rapid, noninvasive means of acquiring cross-sectional images of any portion of the body. Combined with a peripheral venous injection of contrast medium, HCT can produce computer-rendered, "angiogram-like" images of vasculature. These computer-generated multiplanar and three-dimensional HCT angiographic images were helpful in the diagnosis and accurate anatomic characterization of a porto-azygous shunt. A brief discussion of scanner and contrast medium protocol considerations necessary to achieve adequate vascular opacification for volumetric data reconstructions and diagnosis are outlined.