Meckel-Gruber syndrome is a monogenic congenital disorder characterized by occipital encephalocele, polydactyly, and polycystic kidneys. This syndrome is incompatible with life. We report a case diagnosed on fetal ultrasound at a gestational age of 22 SA and 6 days, presenting the clinical triad of Meckel-Gruber syndrome. A medical termination of the pregnancy was indicated. From this rare case, and through a review of the literature, we will discuss the different clinical, ultrasound and prognostic aspects of this rare pathology.