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(Circulation. 1971;44:926.)
© 1971 American Heart Association, Inc.

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Left Anterior Oblique View for Evaluation of Left Atrial Size

MURRAY G. BARON M.D.¹

¹ From the Department of Radiology, The Mount Sinai Hospital and Mount Sinai School of Medicine of The City University of New York, New York, New York.

The left anterior oblique film of the chest provides a sensitive and accurate gauge of left atrial enlargement. The posterior wall of the atrium, which distends when the chamber enlarges, is seen in profile in this view. Dilatation of the left atrium is almost always reflected by this segment which assumes a convexly, curved contour. This finding is independent of most of the conditions that can alter the other roentgen signs of left atrial enlargement.

Key Words: Mitral stenosis • Mitral insufficiency