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Fig. 2A. —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 low-dose MDCT scan shows abnormal left ethmoid bulla (curved arrow). No discrepancies were noted.