Complete tracheal duplication with a communicating oesophageal foregut malformation in a dog

A complete tracheal duplication with a communicating foregut malformation has not been previously reported. We now describe the clinical presentation, computed tomography imaging features and pathological findings associated with this condition in a 12-week-old dog. The dog presented with recurrent episodes of bronchopneumonia and a soft tissue swelling in the ventral cervical region. The main findings were a congenital tracheoesophageal fistula connecting the tracheal and oesophageal anomalies, with secondary moderately neutrophilic bronchopneumonia. In addition, there was a sus-pected concurrent congenital hypertrophic cardiomyopathy and atrioventricular endocardiosis. This report highlights a novel foregut duplication and may assist in understanding the currently debated aetiopathogenesis of this condition in both humans and animals. (c) 2023 Elsevier Ltd. All rights reserved.