INTRODUCTION
Improvements in fetal ultrasound have increased the number of congenital ductus arteriosus aneurysm (DAA) reported in the last years, but identifying high-risk aneurysms is today a challenge (1). In most fetuses, DAA is an incidental finding during the third trimester, but earlier diagnosis has been reported (2). The exact pathogenesis remains unclear.
Most fetuses and neonates with DAA and no other associated complications may be asymptomatic and follow a benign course with spontaneous regression (3). However, potential complications may be severe, including thrombosis, compression of adjacent structures, or spontaneous DAA rupture (3). Thrombosis of DAA has been previously reported with severe consequences (2, 4-7). Currently, management of ductus arteriosus thrombosis in fetuses and neonates remains controversial, ranging from a conservative to a surgical approach.