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Serial Changes in Hamman's Sign Secondary to the Evolution of a Shallow Left-Sided Spontaneous Pneumothorax

Hamman's sign is a rare phenomenon caused by pneumomediastinum or pneumothorax. It was proposed for the first time in 1937 by Louis Hamman. It presents as a crunching or clicking noise in synchrony with the heartbeat and is best heard in the left lateral decubitus position. This case shows serial