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. 2021 May 30;13(5):e15339. doi: 10.7759/cureus.15339

Figure 3. Lung ultrasound: M-mode.

Figure 3

A. Ultrasound of the right lung apex with M-mode demonstrating a "seashore sign" seen in the presence of lung sliding.

B. Ultrasound of the left lung apex with M-mode demonstrating a "barcode/stratosphere sign" seen in the absence of lung sliding. This is suggestive of a pneumothorax.