Use external viewer Pleural effusions Lower lobe collapse may often be confused with pleural effusions, and the two problems may coexist. An effusion will also obliterate the hemidiaphragm, but tends to have a meniscal upper border, and lacks the specific features of collapse. A decubitus film may help as the fluid will move. The difference between total collapse and massive pleural effusion are described above . That concludes this tutorial.
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