Abstract
Initial echocardiographic examination in a young woman with cardiomegaly suggested the presence of pericardial effusion. Echocardiographic scanning revealed continuity of the space defined posterior to the posterior left ventricular wall with an enlarged left atrium. Subsequent cineangiographic studies confirmed left atrial enlargement and the absence of pericardial effusion. Scanning, which can be accomplished in most, but not in all patients, is an important component technique of the echocardiographic examination for pericardial fluid. Left atrial enlargement represents a potentially common cause of false-positive echocardiographic diagnosis of pericardial effusion, of which the examiner must be aware.
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