In a 12‑year‑old female presenting with a right‑sided rib/shoulder elevation on the Adams forward‑bend test that persists despite repositioning, no pain or neurologic deficits, and otherwise normal physical examination, what is the primary diagnosis and what are the differential diagnoses?

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Primary Diagnosis: Adolescent Idiopathic Scoliosis

The primary diagnosis is adolescent idiopathic scoliosis (AIS), confirmed by the positive Adams forward bend test showing persistent right-sided rib/scapular elevation that does not resolve with repositioning. 1

Clinical Reasoning

This 12-year-old female presents with classic findings for AIS:

  • Age and demographics: She is in the adolescent age range (10-18 years) where AIS is most common, occurring in 1-2% of otherwise healthy children and constituting 75-80% of all scoliosis cases 1
  • Female predominance: AIS has a 10:1 female-to-male ratio for larger curves 1
  • Positive screening test: The Adams forward bend test showing persistent right rib/scapular elevation is the hallmark clinical finding
  • Pubertal timing: She is Tanner 3 for breast development and has not yet reached menarche, placing her at higher risk for curve progression as she is skeletally immature
  • Asymptomatic presentation: The absence of pain, neurologic symptoms, and normal musculoskeletal examination is typical for AIS
  • Normal skin examination: Rules out cutaneous stigmata of spinal dysraphism (hemangiomas, hairy patches, nevi) 1

Differential Diagnoses

1. Congenital Scoliosis

  • Must be excluded through imaging showing vertebral formation or segmentation anomalies
  • Accounts for up to 10% of surgical scoliosis patients 1
  • Less likely given the age of presentation and lack of prior detection

2. Neuromuscular Scoliosis

  • Associated with cerebral palsy, muscular dystrophy, or other neuromuscular disorders
  • Excluded by normal neurologic examination and review of systems 1

3. Intraspinal Pathology (2-4% of AIS cases)

  • Chiari I malformation
  • Syringohydromyelia
  • Tethered cord
  • Intraspinal tumor (rare)
  • Risk factors to assess: left thoracic curve, short segment curve, absence of apical lordosis/hyperkyphosis, rapid progression (>1°/month), functionally disruptive pain, focal neurologic findings, male sex, pes cavus 1
  • This patient lacks these red flags, making intraspinal pathology less likely

4. Syndromic Scoliosis

  • Neurofibromatosis type I, Marfan syndrome, Ehlers-Danlos syndrome, osteogenesis imperfecta
  • Excluded by normal physical examination and negative family history for connective tissue disorders 1

5. Postural Asymmetry (non-structural)

  • Would completely resolve with repositioning on Adams test
  • Excluded by persistent elevation despite proper repositioning

6. Painful Scoliosis Etiologies (not applicable here but important differentials)

  • Osteoid osteoma of posterior elements
  • Vertebral infection (tuberculosis)
  • Spondylolysis
  • Excluded by absence of pain 1

Diagnostic Approach

Immediate next step: Obtain upright PA and lateral spine radiographs 1

This is the standard initial imaging to:

  • Confirm the diagnosis by demonstrating lateral curvature >10° (Cobb angle)
  • Exclude congenital vertebral anomalies
  • Assess curve severity and pattern
  • Evaluate skeletal maturity (Risser index) to predict progression risk 1

When to Consider MRI

MRI of the complete spine is not routinely indicated for typical AIS with normal neurologic examination 1. However, consider MRI if any of these red flags emerge:

  • Left thoracic curve pattern
  • Rapid curve progression (>1°/month)
  • Functionally disruptive pain
  • Focal neurologic findings
  • Absence of apical segment lordosis (hyperkyphosis on lateral radiograph)
  • Male sex
  • Pes cavus 1

Critical Pitfalls to Avoid

  1. Do not dismiss the finding: The maternal great-grandmother's "hunchback" likely represents age-related osteoporotic kyphosis, not hereditary scoliosis, and should not distract from the current diagnosis

  2. Do not delay radiographic confirmation: Clinical screening is not sufficient for diagnosis; radiographs are required to measure the Cobb angle and guide management 1

  3. Do not order MRI routinely: In the absence of red flags, MRI changes management in very few cases and is not cost-effective 1

  4. Monitor for progression: With Tanner 3 development and pre-menarchal status, she is at significant risk for curve progression (up to 70% if Cobb angle >20° in skeletally immature patients) 1

  5. Use PA technique: When ordering radiographs, specify PA (not AP) projection to reduce breast radiation exposure 1

References

1
Guideline

acr appropriateness criteria<sup>®</sup> scoliosis-child.

Journal of the American College of Radiology, 2019

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