External hydrocephalus (EH) can cause poor prognosis, but there is no consensus exists on diagnostic criteria for pathological EH in infants and young children. In this study, we measured extracerebral space of 212 healthy subjects on different anatomical slices and their age correlation were analyzed. The results demonstrated that extra cerebral space measured at different position on axial plane features similar age-related changes. The results of this study may be a valuable reference in diagnosis of external hydrocephalus.
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