Metaphorical signs in computed tomography of chest and abdomen 2014Lan 畉ng
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The document is a chapter from a book on metaphorical signs seen on computed tomography (CT) scans of the chest and abdomen. It discusses several signs seen on CT scans and what they typically indicate. The chapter includes sections on the saber-sheath trachea sign indicating tracheal collapse, the eggshell calcification and rim enhancement sign seen in conditions like silicosis and tuberculosis, and the split pleura sign which is considered the most reliable for distinguishing empyemas from other pleural effusions. It provides images and descriptions of these and other common radiological signs seen on CT scans.