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Fig. 2B. —Coronal multiplanar reformations of multidetector CT (MDCT) scans obtained at level of osteomeatal units (straight arrows) in 24-yearold woman who presented with headache suspected to be caused by chronic sinusitis. R = right; m = maxillary sinus; b = right ethmoid bulla. Reformation of standard-dose MDCT scan shows abnormal left ethmoid bulla (curved arrow) seen in A. Discrepancies in findings of ethmoid bulla were noted between first and second interpretation sessions of reviewer 1 and between reviewer 1 and reviewers 2 and 3 in first interpretation session.