Abstract
Forty-three cases of idiopathic dilatation of the pulmonary artery which have been diagnosed clinically by means of the cardiac catheterization are collected from the English literature and their chief clinical features are summarized. A case of idiopathic dilatation of the pulmonary artery with pulmonary regurgitation is presented. The diagnosis of this anomaly is discussed and differentiation of this benign condition from other cardiac lesions is emphasized.
