Infrapulmonary Effusion

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Abstract
The pseudodiaphragmatic contour of infrapulmonary effusion may differ from the contour of an elevated hemidiaphragm in the frontal view in that its medial portion is straight and shows a gradual inclination upward and laterally from the cardiac shadow, so that its apex is located more laterally. Previous studies indicated that this configuration was seen only in about 50% of cases of infrapulmonary effusion. Using expiration radiographs, it was possible to routinely demonstrate this characteristic pseudodiaphragmatic contour. This provides an additional sign of infrapulmonary effusion and aids in the explanation of the pseudodiaphragmatic contour.

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