Surgical correction of cor triatriatum sinister in a kitten.

A seven-month-old, male domestic shorthair was presented for respiratory distress. Cor triatriatum sinister was diagnosed based on echocardiography. Surgical dilatation and tearing of the anomalous membrane dividing the left atrium resulted in resolution of clinical signs. Intraoperative echocardiography was used to evaluate the adequacy of the repair.