144 Chapter 8 In conclusion, we found that FOHR was large at onset and that treating ventriculomegaly gives a decrease and stabilization in FOHR over time. FOHR and tonsil position were associated, and a 10% increase in FOHR was associated with a +1.6mm increase in tonsil position. Increased head-circumference was associated with an increased FOHR and closed lambdoid sutures before 1 year of age were associated with a +6.92mm increase in tonsil position. Overall, the more common sequence is first occurrence of ventriculomegaly, followed by TH, although we cannot claim a causal relationship.
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