Licence: Public Domain Mark
Credit: Outlines of human pathology / by Herbert Mayo. Source: Wellcome Collection.
Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.
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![pends upon a thin stratum of liquid interveninar between the lungs and the walls of the chest. In that case the voice of the patient, when heard through the instrument, has a squeaking tone resembling that of Punch ; or a shrill sharp tone seems vibrating upon the surface of the lung, echoing, or rather accompanying the voice of the patient. This sound is termed oegophony. It disappears as the quantity of fluid increases : at the same time the chest is dull on percussion, and the lung being compressed, respiration is totally extin- guished in it. When in the ordinary process of recovery the liquid is in great part reabsorbed, the oegophony becomes again audible. At this period the affected side becomes less than the other; the lung being slower in expanding to its original size than the water in being absorbed. Chronic inflammation of the pleura displays various fea- tures ; or, under this head, several dissimilar affections have been grouped. One of these is attended with the formation of a general layer of adherent lymph upon the pleura, and immense se- rous effusion, but is without the characteristic pain or fever of pleurisy. This affection existed, masked by other dis- ease, in the case of tuberculous affection of the pancreas given at page 410. A less effusion, with partial deposition of lymph depend- ing upon partial inflammation, is of frequent occurrence. Thickening of the pleura without adhesion [u. 93.], the membrane sometimes approaching cartilage in hardness and crispness, is another consequence of chronic inflamma- tion. Phosphate of lime is sometimes deposited in pleuritic lymph. Empyema. Suppuration in the pleura is less a consequence of chronic than of protracted acute inflammation. \ii. 90.] This complaint may be surmised to exist, when the symp- toms denoting pleuritic effusion, instead of gradually lessen- ing, persist, the patient falling at the same time into hectic fever. In this case paracentesis thoracis is again necessary. In a boy, upon whom I performed that operation, for empyema ensuing upon fracture of the ribs, complete recovery fol- lowed : the discharge of matter slowly lessened; the parietes](https://iiif.wellcomecollection.org/image/b21066735_0526.jp2/full/800%2C/0/default.jpg)
