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This video demonstrates the presence of lung sliding. The image is obtained using a 7.5-MHz vascular transducer. The transducer is in longitudinal orientation and placed perpendicular to the chest wall to scan through the second intercostal space in the midclavicular line. The resolution of the 7.5-MHz transducer is superior to that of the 3.5-MHz transducer at the expense of reduced penetration (see also Chapter 79). Video available on AccessMedicine.com.