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VIDEO A12-1: Normal Ultrasound.

From: Harrison's Principles of Internal Medicine, 20e

This video demonstrates A-lines, an ultrasound artifact that is consistent with normal lung parenchyma. The bright white horizontal line at about 1 cm depth is the pleural reflection. Because reverberation of the ultrasound off the pleura, this line is then seen reflect twice at regular intervals.

10 secs
Author(s) Patricia A. Kritek, John J. Reilly, Jr.
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