CTICasesDouble Outlet Right Ventricle (DORV) in a Cat
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Imaging findings
CT of a cat, performed without sedation, shows a double outlet right ventricle (DORV) with both the pulmonary artery and the aorta originating from the right ventricle. A large ventricular septal defect (VSD) is present beneath. Significant shunt vascularity is seen in the lungs. The cat's aorta demonstrates two main branches, with the left subclavian arising separately, and a single large trunk giving rise to the right arm, head, and neck vessels (a "feline arch").
Key takeaways
Double outlet right ventricle is a complex congenital heart defect where both great arteries arise from the right ventricle. It is seen in animals, including cats, where it can be managed medically for years. Cats and dogs typically have a "feline arch" with two aortic branches, distinct from the "bovine arch" (single trunk) seen in cows. CT can be performed without sedation in animals using specialized techniques.
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