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The lung point (pneumothorax). Left (real-time), only an ill-defined (but sufficient) A-line is visible. Right, M-mode shows that in a particular area of the chest wall, the lung is (before the vertical arrow) or is no longer (after the arrow) in contact with the pleural line in a cyclic rhythm. This sudden appearance, or disappearance, of lung signs, the lung point, is specific to pneumothorax.
