Abstract
A 22-day-old calf was found to have congenital fistula between the right coronary artery and the right atrium. The heart was severely hypertrophic. The ductus arteriosus and foramen ovale were widely patent.
The right coronary artery was markedly dilated in the coronary groove to be 1.8cm in diameter. It was also enlarged further in the atrium, forming a saccular dilatation 2 by 3cm in size. This dilatation included six fistulae 0.7 to 3.5mm in caliber.
As a result of hypertension of both atria due to a large shunt, general congestion followed by pulmonary hemorrhage was considered to be a cause of debility and death of the calf.
