Prior to the use of bronchoscopy and roentgenoscopy in detection of pulmonary lesions, coughing of blood was almost always attributed to pulmonary tuberculosis. With increased employment of indirect visualization of pulmonary structures by roentgenoscopy and direct inspection of the tracheobronchial tree by bronchoscopy, many other causes have been found to be responsible for bleeding from the respiratory tract.
The majority of lesions that cause bleeding from the tracheobronchial tree are well known and are usually easily identified when the circulatory and respiratory tracts are carefully examined. I shall neither attempt to enumerate the more frequent causes of pulmonary hemorrhage nor suggest methods in differential diagnosis but shall confine this report to discussion of a type of bleeding, the etiology and treatment of which are apparently not well understood.
Many references are found in medical literature to conditions such as dry bronchiectasis, hemorrhagic bronchiectasis, idiopathic. pulmonary hemorrhage, Osler's disease, hemangioma of