Coarctation of the aorta is characterized by narrowing of the distal aortic arch which can lead to reduced blood flow in the fetal aortic arch, leading to arch hypoplasia, usually clinically evident after birth. Coarctation of the aorta is a common congenital heart defect accounting for about 8% of heart defects. Prenatal diagnosis of fetal coarctation is always difficult. It is mainly suspected by ventricular disproportion (left ventricle smaller than right ventricle). We present the case of a patient referred to our service for the management of a suspected fetal heart disease during pregnancy estimated at 23 weeks of amenorrhea

Keywords : Prenatal Diagnosis; Coarctation.