A five-month-old, 3.8 kg intact male Maine coon cat presented for dyspnea characterized by increased respiratory effort in addition to open-mouth breathing. Thoracic radiographs showed pectus excavatum, enlarged cardiac silhouette, and generalized interstitial patterns. Echocardiography revealed normal left atrial (LA) and left ventricular dimensions. A large tubular structure, suspected to be a distended pulmonary vein (PV), was identified as draining into the LA. Severe eccentric and concentric right ventricular hypertrophy and paradoxical septal motion were noted. Based on Doppler echocardiography, both pulmonary venous and pulmonary artery pressure was severely elevated. Clinical, radiographic, and echocardiographic abnormalities were hypothesized to result from pulmonary vein stenosis (PVS), causing severely elevated pulmonary venous pressures and resulting in clinical signs of left-sided congestive heart failure (L-CHF) and severe post-capillary pulmonary hypertension (Pc-PH). The prognosis for good quality of life was assessed as poor, and the owner elected euthanasia. Necropsy confirmed the presence of PVS with severe dilation of the PVs draining all but the left cranial lung lobe. All lung lobes except the left cranial lobe had increased tissue density and a mottled cut surface. This case report shows that, in rare cases, both L-CHF and Pc-PH may be present without LA enlargement. To the authors’ knowledge, this is the first report on PVS in veterinary medicine.

Tetralogy of Fallot with atresia of the pulmonary artery (ToF-PA) is a rare congenital cardiac malformation. The life expectancy of affected canine individuals is short: in fact, only puppies or young adults with ToF-PA are described in literature. Typically, these patients require general anaesthesia for diagnostic procedures, and are considered at high risk for anaesthesia-related complications. The present report describes successful anaesthesia for dental surgery of a 12-year-old dog affected by ToF-PA and an extracardiac shunting vessel connecting aorta and pulmonary artery. The echocardiographic findings are described and the anaesthetic protocol and the complications encountered during anaesthesia are discussed.