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Pericardial Effusion Vs Pleural Effusion

Usually pericardial effusion(PE) is not found behind the left atrium,because the pericardial attachments are refleted onto the pulmonary veins.Somtimes,PE can be visualized in the oblique sinus,which is located behind the LA. A PE is anterior to the descending aorta,whereas a pleural effusion(PL) is posterior to the aorta.