Dilatation of the conus and of the main trunk of the pulmonary artery is frequently associated with patent ductus arteriosus. Dilatation of the smaller branches of the pulmonary artery (diffuse dilatation) is a less frequent occurrence, and its clinical demonstration is a rarity, we believe. Further, diffuse pulmonary dilatation is referred to in reports of a varied group of conditions, many of which occur practically only in older patients.1 One wonders whether diffuse pulmonary dilatation might not be more frequently seen if sought for systematically among large groups of children with congenital cardiac disease or with mitral stenosis.
REPORT OF A CASE
A boy was first seen in June 1926, when he was 3½ months of age. At that time he showed the characteristic signs of patent ductus arteriosus: a rough systolic murmur over the entire chest, a thrill extending into the neck and dulness on the left in