Basilar Invagination / Impression (BI)

FACTS

  • most common congenital anomaly of CCJ
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Type 1
Type 2
Definition
no Chiari malformation
with Chiari malformation
Treatment
transoral surgery + PSF
foramen magnum decompression

HPI


Associated syndromes:
  • Down syndrome
  • Klippel-Feil syndrome
  • Chiari
  • syringomyelia
  • RA
  • Trauma
  • Paget’s
  • osteogensis imperfecta
  • osteomalacia
  • rickets
  • hyperparathyroidism

PHYSICAL EXAM

IMAGING

Measure basal angle (θ). Normal mean basal angle 130˚, platybasia > 145%
notion image
A/P