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Fig. 1A. —Axial multiplanar reformations of multidetector CT (MDCT) scans obtained at level of sphenoethmoidal recess in 35-year-old man who presented with headache suspected to be caused by chronic sinusitis. R = right; a = anterior ethmoid cell; b = basal lamina (arrowhead); p = posterior ethmoid cell. Reformation of low-dose MDCT scan shows normal right (curved arrow) and abnormal left (straight arrow) sphenoethmoidal recess. No discrepancies among reviewers or between pairs of reviewers were noted.