Merck Manual

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Pneumothorax (X-Ray)
Pneumothorax
Pneumothorax (X-Ray)

Air appears dark on x-rays. In this x-ray showing a pneumothorax, one side of the chest is dark because there is only air where the now collapsed lung used to be.

By permission of the publisher. From Berman L. In Atlas of Anesthesia: Critical Care. Edited by R Miller (series editor) and RR Kirby. Philadelphia, Current Medicine, 1997.

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Pneumothorax