label: Dilatation of the ductus arteriosus
label_lc: dilatation of the ductus arteriosus
description: "Ductus arteriosus aneurysm (DAA) is a saccular dilatation of the ductus arteriosus. DAA can be either congenital or acquired (e.g. as a complication of surgical closure of a patent ductus arteriosus). Although the majority of patients with congenital DAA are asymptomatic and have a benign course, severe complications, such as rupture or thromboembolism, can occur. DAA is likely to emerge in the third trimester from the aortic junction of the DA, extending towards its pulmonary end."