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Spondylocostal dysostosis
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Spondylocostal dysostosis

Spondylocostal dysostosis is a group of conditions characterized by abnormal development of the spine and ribs, leading to a short-trunk body stature and potential respiratory complications.

Overview

This condition involves misshapen and fused vertebrae and ribs. Because the chest cavity is often small and rigid, infants may experience life-threatening breathing problems. Many affected individuals exhibit short-trunk dwarfism, where the torso is short but the arms and legs are of normal length.

Symptoms

  • Abnormal side-to-side curvature of the spine (scoliosis).
  • Fused or missing ribs.
  • Short, rigid neck and short torso.
  • Respiratory difficulties due to restricted chest expansion.
  • Inguinal hernia.
  • Potential neural tube defects, such as spina bifida or Chiari malformation.

Causes & Risk Factors

The condition is caused by mutations in several genes, most notably the DLL3 gene. These genes are involved in the Notch signaling pathway, which is critical during embryonic development for somite segmentation—the process that separates future vertebrae and ribs. When this pathway is disrupted, the bones do not form or separate correctly.

Inheritance

Spondylocostal dysostosis can be inherited in either an autosomal recessive or autosomal dominant pattern. Autosomal recessive forms are more common and typically present with more severe symptoms. In recessive cases, both parents must carry a copy of the mutated gene.

Frequency

Spondylocostal dysostosis is a rare condition, and its exact prevalence remains unknown.

Frequently Asked Questions

Yes. The reduced chest wall compliance can impair ventilation, so anesthesiologists should plan for possible fiber‑optic intubation and postoperative ventilatory support. Intra‑operative positioning must avoid excessive pressure on fused ribs or vertebrae to prevent fractures. Pre‑operative pulmonary function testing (if age‑appropriate) helps assess baseline respiratory reserve. Communication between the surgical, anesthesia, and respiratory teams is vital to minimize peri‑operative complications.
Early referral to a pediatric orthopedic surgeon is critical. Serial spine radiographs every 6–12 months allow monitoring of curve progression. For curves > 20–30°, bracing (e.g., custom thoracolumbosacral orthosis) can slow progression. If the curve rapidly exceeds 45° or is associated with rib fusion causing restrictive lung disease, surgical intervention such as growing‑rod implantation or vertebral column resection may be considered. Physical therapy focused on core strengthening and maintaining thoracic flexibility supports non‑surgical management.
Severe tachypnea (respiratory rate > 60 breaths/min), persistent retractions, cyanosis that does not improve with supplemental oxygen, and poor chest expansion on physical exam are red flags. A chest X‑ray showing multiple fused or absent ribs and a markedly narrowed thoracic cavity confirms the suspicion and warrants immediate pediatric intensive care assessment.
Testing is usually ordered through a clinical genetics service. A blood draw (2–5 mL in an EDTA tube) provides DNA for a targeted gene panel that includes DLL3, MESP2, HES7, and TBX6. Some laboratories also offer whole‑exome sequencing if the panel is negative. Prenatal testing (chorionic villus sampling or amniocentesis) is possible if a known familial mutation exists. Genetic counseling before and after testing is essential to discuss inheritance patterns and reproductive options.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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