. Radio-diagnosis of pleuro-pulmonary affection . y,that is to say up to the period of increase, it is easy to under-stand the formation of the curve, if we bear in mind thisanatomical fact, that the lung, free from all parts in thepleural cavity, is only retained and fixed at a single point:that is at the level of the hilus where the bronchi and vesselsenter and at its inner margin where the ligament of the lungis attached. When an effusion is produced in the pleura, the fluid, PLEURISY OF THE LARGE CAVITY 19 following the laws of gravity, collects at the base above thediaphragm. In proportio
. Radio-diagnosis of pleuro-pulmonary affection . y,that is to say up to the period of increase, it is easy to under-stand the formation of the curve, if we bear in mind thisanatomical fact, that the lung, free from all parts in thepleural cavity, is only retained and fixed at a single point:that is at the level of the hilus where the bronchi and vesselsenter and at its inner margin where the ligament of the lungis attached. When an effusion is produced in the pleura, the fluid, PLEURISY OF THE LARGE CAVITY 19 following the laws of gravity, collects at the base above thediaphragm. In proportion as it increases, it presses backthe lung from the base upward, which, on account of itselasticity, becomes very much compressed. This goes on inthis way until the level of the fluid reaches the region ofthe hilus. At this point, the lung being fixed offers a seriousresistance to the pressure of the fluid. Meeting resistanceon the inner side, the fluid presses outward, where the lung,being free, is more easily moved; the fluid increases, infil-.
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