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Fig. 2B. —63-year-old man with dyspnea for 24 hr. Chest radiograph revealed loss of volume in middle and lower lobes and small right pleural effusion. Left lung was normal. Ventilation lung scintigram shows defects that are matched to perfusion abnormalities and delayed washout in left lung base (arrow). This study was given intermediate probability for pulmonary embolism on basis of PIOPED (Prospective Investigation of Pulmonary Embolism Diagnosis) criteria. (Courtesy of Coleman RE, Durham, NC)