Parapneumonic Effusions and What the Meaning of “Large” Is

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A computed tomography (CT) measurement of 2.5 cm for size of a pleural effusion associated with pneumonia correlates to a lateral decubitus measurement of 1 cm and is useful for determining the need for thoracentesis.

Source: Moffett BK, Panchabhai TS, Anaya E, et al. Computed tomography measurements of parapneumonic effusion indicative of thoracentesis. Eur Resp J. 2011;38:1406–1411.

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