Abstract:

    Objective　To analyze the relationship between the frontal & ethmoidal area and the hyperpneumatization of frontal sinus. Methods　A retrospective analysis of paranasal coronal computedtomography scans of 200 sides from 100 patients were performed. The junction point between vertical line of orbital plate and anterior cranial fossa, the angle from the line between the above point and attachment point of cribriform plate to horizontal line, the distance from vertical line of orbital plate to attachment point of cribriform plate, were measure respectively.  Results　The angles from the line between the junctional point and attachment point of cribriform plate to horizontal line were (34.52±5.09)°, （42.80±6.19）°, and （52.80±4.89）° at the level of the olfactory fossa with the depths ≤3 mm, 4~7 mm or ≥8 mm respectively. The distances from vertical line of orbital plate to attachment point of cribriform plate were（10.12±1.44）mm and (11.18±1.45 ）mm for the left and right respectively.  Conclusions    The presence of hyperpneumatization of the frontal sinus concerns with the angle from the line between the junctional point and attachment point of cribriform plate to horizontal line, with the more large angle, the more high rate of frontal gasification, and the more deep olfactory fossa.                                               

Key words: Anterior cranial fossa, Crista galli, Olfactory fovea, CT scan, Turbinate bone