Incidence of Asymmetric Occipital Flattening on Cranial CT Scanning

概要

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Although asymmetric occipital flattening (AOF) is frequently seen in the very younger generation, the flat occiput may hardly be observed on routine cranial CT scan in the senior population. The aim of this paper is to clarify whether the age-related difference exists on the incidence of the AOF or not. The author reviewed CT films of 877 patients. All cases were from either a local private general hospital, or a local psychiatric hospital in Kobe. As a result, the younger group of ages up to 39 years had 30 cases of AOF out of 174 (17.2%), while the older group had only 20 AOF out of 703 (2.8%). At a point between the ages of 30's and 40's, the incidence rate of AOF changed very sharply. However, the reason why the incidence in older population decreased apparently remained unclear. Both of laterality of AOF and difference by gender were insignificant. Clinically no distinct manifestation have been observed on the individuals with the flat occiput which was accidentally evidenced on cranial CT. AOF is considered to be an unharmful condition in the adult population. Additional diagnostic procedure may not be required if any evident symptoms come out.
神戸大学の論文
1997-01-24