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Pleural effusion is not always visible as a meniscus in the costophrenic angle. 
A subpulmonic effusion
Pleural effusion ... always visible as a meniscus ... In these cases, ... with signs of CHF ... #Pleural #Effusion
Pleural effusion is bilateral in 70% of cases of CHF.
When unilateral, it is slightly more often
Pleural effusion ... of CHF. ... PA image as a meniscus ... If pleural effusion ... #Pleural #Effusion