“…They are, nevertheless, important as a diagnostic problem and as an operative hazard for the thoracic surgeon. Most of the infantile aneurysms of the ductus arteriosus have been found accidentally at postmortem examination, the patient having died from some other disease; but in eight cases (Roeder, 1901, two cases;Guggenheim, 1930;Esser, 1902, two cases;Fritz, 1933;Scheef, 1939; and the present Case II), death was directly due to rupture of either a saccular or a dissecting aneurysm.…”