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At the base of the lung it is important to identify the diaphragm and the underlying viscera. In this case, the video was taken on the patient's right side, so the liver and diaphragm can be seen on the right side of the screen. The left side of the screen is lung parenchyma (remember that left is cephalad and right is caudad). As the patient inspires, a curtain of grey air artifact sweeps from left (superior) to right (inferior) obliterating the view of the diaphragm and liver. This effectively rules out pleural effusion at this location.