ABSTRACT
The lethal osteochondrodysplasias are rare, their prevalence is estimated at 1 per 10 000 births. Mostly have genetic determinism. To describe the malformations and dysmorphic features in lethal osteochondrodysplasias.Our study involved 32 cases of lethal fetal Osteochondrodysplasias, collected over a period of 14 years in the pathological department of Sousse.Our series consisted of 23 foetuses from a medical termination of pregnancy, 6 newborns and 3 stillbirths. The mean age of mothers was 28 years old, consanguinity was observed in 61%. 3 cases of recurrence of the disease in three families were noted. The bone abnormalities were detected in antenatal ultrasonography in 25 cases [87%] and at birth in 7 cases. Ultrasound showed micromelia in all cases, a narrow chest in 5 cases and spina bifida in 3 cases. The foetopathological exam, including a macroscopic examination, radiological and histological samples of bone, has allowed us, based on the International Classification of 2001 to classify the 32 cases of Osteochondrodysplasias in: 8cases of Achondrogenesis type I [type Parenti-Fraccaro], 3 cases of Achondrogenesis type II [Langer Saldino], 9 cases of lethal osteogenesis imperfecta, 8 cases of thanatophoric dysplasia, 4 cases of Schneckenbecken dysplasia, 2 cases of Short rib polydactyly syndrome, Majewski type and 1 case of asphyxiating thoracic dysplasia