Absent Pulmonary Valve Syndrome in a Calf

Abstract

Absent Pulmonary Valve Syndrome was observed in a three day old male calf. Instead of the semilunar cusps, there was an irregular rim of low elevation of the arterial tunica intima. The heart was found to have ventricular septal defect, mild stenosis of the pulmonary valve annulus and infundibulum, marked dilatation of the pulmonary trunk and left pulmonary artery, agenesis of the ductus arteriosus, double cranial vena cava, secundum atrial septal defect, aberrant left subclavian artery and single coronary artery. The lower part of the trachea was compressed mildly by the dilated pulmonary artery.