Pulmonary tuberculosis: its pathology, nature, symptoms, diagnosis, prognosis, causes, hygiene, and medical treatment . every case. Some time before the softening process beginsin the tubercular mass, the calibre of all the blood-vessels involved inthe diseased structure is obliterated, as if nature had anticipated theulcerative process and the hemorrhage which would evidently followif the vessels were not obliterated. In the early stage of the diseasethe vessels are merely forced aside and compressed by the tubercularmatter, but as the deposit advances they gradually become impervious,and are
Pulmonary tuberculosis: its pathology, nature, symptoms, diagnosis, prognosis, causes, hygiene, and medical treatment . every case. Some time before the softening process beginsin the tubercular mass, the calibre of all the blood-vessels involved inthe diseased structure is obliterated, as if nature had anticipated theulcerative process and the hemorrhage which would evidently followif the vessels were not obliterated. In the early stage of the diseasethe vessels are merely forced aside and compressed by the tubercularmatter, but as the deposit advances they gradually become impervious,and are at length converted into hard fibrous cofds, as we find themin the cavities. Notwithstanding all the care nature has bestowed on PATHOLOGY. 19 the protection of these vessels, they are sometimes ruptured, and fatalhemorrhage is the consequence. When tubercles in the lungs first commence to soften, there is nocommunication existing between them and the bronchial tubes, but asthe softening process goes on the latter soon become involved, andbefore long a passage is formed between them; and it is not an uncom- A section of the superior lobe of the lung, containing tubercles in differentstages, and a vast tubercular cavity: a a a, bronchial tubes opening into thecavity; b b, bands crossing it; c c, coalescing masses of tubercles; d, miliarygranules; e e e, exterior surface of the lung. mon thing, on opening a large cavity, to find several tubes terminatingin it. Sometimes these openings become obstructed by the accumu-lation of viscid mucus, tubercular matter, or other impediments, whichprevent, for a limited period, the elimination of the contents of thecavity. Sometimes these cavities, when situated near the surface ofthe lung, fail to form a communication with the bronchial tubes; inthis case they occasionally penetrate the pleura, by ulceration, thecontents of the cavity escaping into the pleural sac, and producingspeedy and fatal inflammation. And it is a remarkable cir
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherphiladelphiajblipp
