Abstract
An arteriovenous fistula of the common carotid artery and vena cava cranialis was observed in a 23-day-old male Holstein calf. This case had a large pulsating aneurysm synchronized with pulse of the heart. The aneurysm (7.3 × 5.5× 4.8cm), having various sized foldings onits inner surface, was situated at the point of anastomosis. The aneurysmal wall was so thin that thecontained blood was visible.
Both ventricles were markedly dilated. As minor changes in the heart, there were patencies of foramen ovale (4mm in diameter) and dcutus arteriosus (2mm in diameter).
