DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Pleural effusion, X-ray. This is a condition in which liquid accumulates in the lining of the chest cavity. It is seen here as the large white area in lower frame, which would be black in a healthy person. The liquid compresses the lung, which leads to breathing difficulties. In this case, the effusion was caused by a broken rib (not clearly seen). It is treated by aspiring (draining) the fluid, which relieves the pressure.
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