Normal Vermis Development

  • Vermis grows rostro-caudally, covering the 4th ventricle:
    • Usually complete by 18 weeks gestation.
    • May continue developing up to 24 weeks gestation.

    Clinical Significance of Gestational Age at Diagnosis

    • Vermian hypoplasia identified before 24 weeks:
      • Approximately 50% resolve by term (Patek et al. 2012).

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