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Fig. 3B. —Sagittal multiplanar reformations of multidetector CT (MDCT) obtained at level of left maxillary sinus (m) in 52-year-old woman who presented with headache suspected to be caused by chronic sinusitis. Enlarged periodontal space (arrow) was consistently identified throughout all interpretations. P = posterior; f = frontal sinus; m = maxillary sinus. Reformation of standard-dose MDCT scan reveals enlarged periodontal space (arrow) as clearly as seen in A.