Fig. 3From: An unusual presentation of developmental anomalies of the cardiovascular system including tetralogy of fallot, double outlet right ventricle, patent foramen ovale and persistent right aortic arch in a Friesian calfPhotograph of the oesophagus and surrounding muscle and connective tissue, showing the ductus arteriosus (arrow heads) and the annular stricture of the oesophagus (arrow)Back to article page