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FIG 2. Aeration of sphenoid bone as evidenced by reformatted sagittal images. In this and subsequent figures, patient population was divided into first to seventh or older decades of life. Patients in first and second decades of life were further divided into two groups each. Each of the tandem bars in each age group represents percentage of subjects whose sphenoid aeration is classified into type I (black bar), II (gray bar), III (hatched bar), or IV (white bar). See Methods section for classification of sphenoid aeration.FIG 3. Age-related changes in volume of sphenoid aeration in 76 female and 85 male patients. Data are expressed as means ± SDs
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