Forms of obstruction at the orifice of the pulmonary artery, with irregular course of the aorta
Fig 1. Form of the valvular apparatus in obstruction of heart of child 10 or 12 years of age.
Fig 2. Drawing of obstruction at outlet of right ventricle. Note that there are two valves instead of three, though one of the two appears to have been formerly divided. Orifice is of considerable size, though obstruction at exit of ventricle is still extreme. Removed from girl 19 years of age.
Fig 3. Case in which pulmonary artery was of small size, probably from premature obliteration of arterial duct. Aorta arose from right ventricle, crossed over right bronchus, passed behind trachea, and gave off four vessels - the right and left carotid and the right and left subclavian arteries. Removed from a boy 11 1/2 months old.
On Malformations of the Human Heart With Original Cases and Illustrations. Thomas B. Peacock, 1866.