Ductus arteriosus aneurysm (DAA) is characterized by a saccular or
fusiform dilatation of the ductus arteriosus. The formation of a
thrombus at that level is infrequent and potentially lethal. We present
a case of a fetus with a DAA diagnosed during fetal life by 2-D, 3-D,
and 4-D STIC echocardiography. Although a thrombus in the ductus and
hypertrophy of the right ventricle was identified in postnatal
echocardiography, a conservative approach was adopted with good outcome.
The features of our case highlight the importance of serial ultrasound
in the fetal and neonatal period to assess fetal aneurysm growth as well
as to notice any modification of the flow within.