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37 DETERMINATION OF INTRACRANIAL SPACES IN CHILDREN WITH MACROCEPHALY

A new CT-method has been developed to determine the volumes of intracranial spaces. This technique was applied in sixty apparently normal children resulting in graphs showing the relationship between these intracranial volumes and age within the range birth to fifteen years. It was postulated that only those volumes which exceeded the mean for the particular age by more than twice the standard deviation were too large. Based on our acquired data it is possible to differentiate more precisely between megalencephaly (M), external ventricular obstructive hydrocephalus (EVOH) and communicating hydrocephalus (CO). When we compared the results of the new volume calculations with the length measurements 15 of 25 macrocephalic patients could retain the former diagnosis. In four of them, however the application of the new method resulted in a combination (*) of two diagnoses. We concluded that both methods were suitable for diagnosing communicating hydrocephalus. However, when assessing brainsubstance, a large discrepancy was found between length measurements and volume calculations.