Lethal and life-limiting skeletal dysplasias: Selected prenatal issues

Area of Science:

• Medical Genetics
• Pediatrics
• Radiology

Background:

• Skeletal dysplasias are a diverse group of congenital genetic disorders affecting bone and cartilage.
• Over 461 distinct skeletal dysplasia diseases are classified into 42 groups.
• The incidence of all skeletal dysplasias combined is greater than 1 in 5000 live births.

Purpose of the Study:

• To review the prenatal ultrasonographic features of lethal and life-limiting skeletal dysplasias.
• To emphasize the importance of accurate prenatal diagnosis for prognosis and management.
• To discuss common and less frequent skeletal dysplasia types.

Main Methods:

• Review of prenatal ultrasonographic findings in various skeletal dysplasias.
• Discussion of characteristic sonographic predictors of lethality.
• Categorization of dysplasias based on frequency and prenatal presentation.

Main Results:

• Prenatal ultrasound can identify lethal skeletal dysplasias through specific findings like bell-shaped thorax, short ribs, and reduced lung volume.
• Common lethal skeletal dysplasias discussed include thanatophoric dysplasia, osteogenesis imperfecta type II, achondrogenesis, and campomelic dysplasia.
• Less common but significant dysplasias like asphyxiating thoracic dystrophy and fibrochondrogenesis also have discernible prenatal features.

Conclusions:

• Accurate prenatal diagnosis of skeletal dysplasia is crucial for determining prognosis and guiding clinical management.
• Prenatal ultrasonography is a valuable tool for detecting indicators of lethal skeletal dysplasias.
• Understanding the spectrum of prenatal findings aids in distinguishing between various types of skeletal dysplasias.