ULMONARY EMBOLISM IS A COMmon and serious medical condition leading to the hospitalization or death of more than 250 000 people in the United States each year. 1 It is the third leading cause of cardiovascular mortality and is estimated to result in 5% to 10% of all deaths in US hospitals. 2 Despite the potentially lethal nature of this condition, pulmonary embolism remains one of the most difficult conditions for clinicians to diagnose accurately. 3 Given the high mortality of untreated pulmonary embolism, timely accurate diagnostic tests are essential to enable the For editorial comment see p 2788.

Except for NIPF, the various subtypes of idiopathic interstitial pneumonias often have a characteristic appearance that allows differentiation at thin-section CT.

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