Case report: Imaging features of aorta-right atrial tunnel in a dog using two-dimensional echocardiography and computed tomography

Case report: Imaging features of aorta-right atrial tunnel in a dog using two-dimensional echocardiography and computed tomography

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A 7-year-old castrated male Pomeranian dog weighing 5 kg presented with a right-sided continuous murmur without any clinical signs.Thoracic radiographs indicated cardiomegaly and right atrial (RA) bulging.Echocardiography revealed a tunnel originating from the right coronary sinus of Valsalva and terminating in the RA.Contrast echocardiography revealed pulmonary arteriovenous anastomoses.Computed tomography (CT) demonstrated a tortuous shunting vessel that originated from the aorta extending in a ventral direction, ran along the right ventricular wall, and was inserted into the RA.

Based on these diagnostic findings, the dog Fleece Harness Tape was diagnosed with the aorta-RA tunnel.At the 1-year follow-up visit without treatment, the dog showed no significant change except for mild left ventricular volume overload and mildly decreased contractility.To the best of Medical and Ambulatory supplies / Diagnostic Instruments and Supplies our knowledge, this is the first case report of an aorta-RA tunnel that has been described in detail using echocardiography and CT in a dog.In conclusion, the aorta-RA tunnel should be included in the clinical differential diagnoses if a right-sided continuous murmur is heard or shunt flow originating from the aortic root is identified.