Non-traumatic hemothorax is a rare condition. It is generally due to the erosion of a vessel due to some pathologic lesion. In tuberculosis of the lung, the pulmonary arteries or their branches are those generally involved. The tuberculous process weakens the walls and in many cases numerous aneurisms are formed. This condition appears to be present more commonly about the middle of the lung and at the periphery (West).
Search through the literature gives ample proof that but few cases of non-traumatic hemothorax occur, or at least, are reported. Sticker and Dieulafoy both affirmthat hemorrhage (non-traumatic) from the lungs can take place into the pleura. A case has been reported of hemothorax due to tuberculous erosion of an intercostal artery, and W. H. Walsh1 reports two cases, recorded by Andral, of hemorrhage into the pleura— "pleurisy had long existed and in both instances the patients were tuberculous." Dr. Watson
BILLINGS FT. A CASE OF NON-TRAUMATIC HEMOTHORAX. JAMA. 1908;L(22):1789. doi:10.1001/jama.1908.25310480027002
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