Methods25normal skull were used to investigate the configurations of IOF and IOG.
方法正常颅骨25个，肉眼观察眶下裂和眶下沟解剖形态。
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Objective To show imaging findings of inferior orbital fissure(IOF)and groove(IOG)on axial CT scans and to discover their anatomic variations, so as to avoid misdiagnosing them as orbital fracture.