Rapidly growing thrombus from a ductus arteriosus aneurysm in a neonate.

Ductus arteriosus aneurysm (DAA) is a rare cardiovascular anomaly, and thrombosis of DAA is even less common. The management of asymptomatic DAA with a thrombus is controversial. We here report a neonate with a thrombus from a DAA that grew rapidly into the pulmonary artery. The thrombus was detected incidentally in the main pulmonary artery by routine screening echocardiography. There was no clinical evidence of its presence until a few days after birth. The thrombus grew rapidly, despite administration of heparin. Six days after birth, the patient became cyanotic and had developed right ventricular pressure overload as a result of obstruction of the left pulmonary artery. The thrombus was immediately removed and the DAA resected. The patient was discharged home without any complications. Complications related to thrombus of a DAA can be critical and therefore require careful monitoring. Learning objective: A thrombus extending from a ductus arteriosus aneurysm into the pulmonary artery can have serious consequences; thus, careful monitoring is required. Any signs of such complications should prompt immediate consideration of removal of the aneurysm and thrombus.