Cor triatriatum sinister in a cat: case report

Abstract

Cor triatriatum sinister is an uncommon congenital condition characterized by an aberrant membrane that divides the left atrium into two chambers due to an abnormal incorporation of the pulmonary veins. This anomaly obstructs blood flow to the left atrium, leading to pulmonary hypertension and, consequently, congestive heart failure. This case report presents a cat that was treated in the veterinary cardiology service for dyspnea. An echocardiogram revealed an intra- atrial membrane within the left atrium. Due to the patient´s deteriorating condition, euthanasia was performed, and subsequent necropsy and histopathology examination also confirmed the diagnosis of cor triatriatum sinister.