Congenital Scoliosis
Spinal curvature from vertebral malformations present at birth
ICD-10: Q67.5 · deformity condition
Congenital scoliosis results from abnormal vertebral development during the first six weeks of embryonic life. Unlike idiopathic scoliosis, the curve is caused by structural bony defects rather than unknown factors. The two main categories are failures of formation (e.g., hemivertebra — a wedge-shaped half vertebra that tilts the spine) and failures of segmentation (e.g., unilateral bar — a bony bridge fusing adjacent vertebrae on one side). Mixed defects are most severe. Because the structural imbalance is built into the skeleton itself, congenital curves are less responsive to bracing and often require early surgical intervention. Associated anomalies are common and must be screened for at diagnosis. Cardiac defects occur in up to 15% of patients (VACTERL association), genitourinary anomalies in 20–30%, and intraspinal anomalies — including tethered cord, diastematomyelia, and syrinx — in 20–40% (requiring MRI of the entire spine). Rib fusions and chest wall deformities can severely restrict lung growth. Treatment depends on the defect type, curve location, and rate of progression. Hemivertebra excision with short-segment fusion achieves excellent correction when performed early. Unilateral bars with contralateral hemivertebra are the most progressive defect type and typically require early surgical intervention.
Anatomy & Pathology
Normal vertebral development requires two sequential processes: formation (the vertebra must fully develop from its somitic precursor) and segmentation (adjacent vertebrae must cleanly separate). Congenital scoliosis results from failures in one or both processes. Failure of formation produces hemivertebrae — fully segmented single-sided wedge vertebrae — or wedge vertebrae. Failure of segmentation produces unsegmented bars — fusions between adjacent vertebrae on one side — or block vertebrae (bilateral fusion). Mixed defects combine both. The curve's severity and progression risk depend on which type of anomaly is present, how many levels are involved, and whether the anomaly creates a growth imbalance — more growth on the convex side than the concave side — that worsens the curve over time.
Symptoms
- Visible trunk asymmetry or rib prominence noted in infancy or childhood
- One shoulder or hip higher than the other
- Truncal shortening and reduced height potential from early vertebral fusion
- Neck tilt (if cervical or cervicothoracic hemivertebra)
- Neurological deficits if intraspinal anomaly is present
- Restrictive breathing from chest wall deformity with multiple rib fusions
- Asymptomatic incidental finding on chest X-ray in infants
Causes & Risk Factors
- Failure of vertebral formation: hemivertebra, wedge vertebra (embryonic insult weeks 4–6)
- Failure of segmentation: unilateral bar, bilateral bar (block vertebra)
- Combined defects: unilateral bar with contralateral hemivertebra (most progressive pattern)
- Maternal exposure to valproic acid, alcohol, or hyperthermia during embryogenesis
- Associated with VACTERL, Goldenhar syndrome, Klippel-Feil syndrome
Imaging Findings
Imaging studies are commonly used to identify findings associated with this condition. Results vary by individual; a qualified spine specialist interprets findings in the context of a full clinical evaluation.
MRI
- Vertebral anomaly characterization: hemivertebra (wedge-shaped half-vertebra) or block/bar vertebra (failure of segmentation)
- Intraspinal anomalies present in ~20%: diastematomyelia (split cord), syringomyelia, tethered cord, intradural lipoma
- MRI of the full spine is mandatory before surgery to detect occult intraspinal pathology
- Spinal cord morphology at the level of deformity — compression or tethering changes surgical approach
- Note: MRI is essential even if X-ray is used for curve measurement
CT Scan
- 3D reconstruction provides the most precise anatomical map of the anomalous vertebrae for surgical planning
- Pedicle morphology and size critical for determining instrumentation strategy in very small children
- CT is the gold standard for characterizing hemivertebra anatomy
X-Ray
- Standing AP and lateral scoliosis films for Cobb angle measurement and curve classification
- Annual surveillance films to track rate of curve progression
- MRI cannot replace X-ray for Cobb angle measurement and serial monitoring
Who Is Commonly Affected
The following patterns are commonly associated with this condition based on published population studies. Individual presentation varies; these figures are informational only.
Peak Age Range
Detected at birth or during childhood (usually first decade); may be identified prenatally on ultrasound
Gender Distribution
Roughly equal sex ratio
Estimated Prevalence
Approximately 0.5–1 per 1,000 live births; congenital heart defects present in ~30%, renal anomalies in ~25% — full workup mandatory at diagnosis
Treatment Options
Conservative
- Observation with serial X-rays every 4–6 months for non-progressive, well-balanced defects
- TLSO bracing — limited effectiveness for structural bony defects but may control compensatory curves
- Physical therapy to maintain flexibility and core strength in compensatory regions
Surgical
- Hemivertebra resection with short posterior fusion — definitive correction in young children with fully segmented hemivertebra
- In-situ posterior fusion to arrest progressive curve before deformity worsens
- Growing rod or VEPTR (Vertical Expandable Prosthetic Titanium Rib) constructs for young children with thoracic insufficiency syndrome
When to see a spine specialist
Congenital scoliosis should be evaluated by a pediatric spine specialist immediately upon diagnosis. MRI of the entire spine and cardiac and renal screening are mandatory at first visit. Any progressive curve — particularly unilateral bar with contralateral hemivertebra — warrants early surgical planning rather than watchful waiting.
Specialists Who Treat Congenital Scoliosis
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Questions to Ask Your Doctor
Bring these questions to your next appointment about congenital scoliosis.
- 1
What type of vertebral anomaly do I have — a hemivertebra, a unilateral bar, or both — and which carries the highest risk of progression?
- 2
Has my child been screened for associated cardiac and renal anomalies, which are present in up to one-third of cases?
- 3
Is there intraspinal abnormality (diastematomyelia, tethered cord) on the MRI that would affect surgical planning?
- 4
What is the predicted rate of curve progression based on my anomaly type and current age?
- 5
If surgery is recommended, is hemiepiphysiodesis (growth modulation) an option, or is spinal fusion with instrumentation required?
Research Evidence
No studies reviewed yet for this condition. Check back soon — our evidence pipeline runs nightly.
Clinical Evidence
Frequently Asked Questions
Does congenital scoliosis always need surgery?
Not always, but many cases do. Fully segmented hemivertebra and unilateral bar-hemivertebra combinations are almost universally progressive and require surgery. Incarcerated hemivertebra (wedged in place without growth potential) and block vertebra may be stable and merely observed. The key is early expert assessment with serial imaging to identify the defect type and track progression before deformity becomes severe.
What other conditions are associated with congenital scoliosis?
Congenital scoliosis has significant associated anomaly rates. Up to 40% have intraspinal anomalies (tethered cord, syrinx, diastematomyelia) requiring MRI screening. Cardiac defects occur in 12–15% and renal/urologic anomalies in 20–30%. Rib fusions and chest wall deformities causing thoracic insufficiency syndrome affect thoracic cases. Screening with full-spine MRI, echocardiogram, and renal ultrasound is standard at diagnosis.
What is the best age for surgery for a hemivertebra?
Most pediatric spine surgeons recommend hemivertebra excision between ages 1 and 5, before the curve becomes large and rigid. Early surgery achieves better deformity correction, limits the length of fusion needed, and allows maximum growth of the remaining spine. Operating before age 5 also avoids the need for repeat procedures or growing rod constructs in most cases.