Schneckenbecken dysplasia

Schneckenbecken dysplasia (also known as snail-like pelvis dysplasia) is an extremely rare, lethal skeletal dysplasia characterized by distinctive radiographic findings, most notably the 'snail-like' appearance of the iliac bones (the German word 'Schneckenbecken' translates to 'snail pelvis'). This condition is a severe chondrodysplasia that affects skeletal development throughout the body, leading to death in the prenatal or neonatal period. The hallmark features include severe shortening of the limbs (micromelia), a narrow thorax, flattened vertebral bodies (platyspondyly), and the characteristic snail-shaped ilia on radiographic imaging. Additional skeletal findings include short ribs, hypoplastic long bones with a dumbbell-shaped appearance, and generalized poor ossification. The condition results from defects in cartilage and bone development, profoundly affecting the skeletal system. Hydrops fetalis and polyhydramnios may be observed prenatally. Schneckenbecken dysplasia is caused by biallelic pathogenic variants in the SLC35D1 gene, which encodes a nucleotide sugar transporter located in the endoplasmic reticulum membrane. This transporter is essential for proteoglycan synthesis in cartilage. Due to the lethal nature of this condition, there is no curative treatment. Management is limited to supportive and palliative care. Prenatal diagnosis may be possible through ultrasound findings and molecular genetic testing when the familial variants are known.

Common questions about Schneckenbecken dysplasia