In other words, it was a mold cast made of clotted blood in the shape of the lung's branched airway passages known as bronchi. It's less rare for patients to cough up bronchial "casts" made of other substances, such as lymph or mucus. But blood is less sticky and sturdy than these other substances, meaning that a cast made of blood is less likely to hold together when coughed up, The Atlantic reported.
Wieselthaler told The Atlantic that in this case, the patient had an infection that increased levels of a protein called fibrinogen, which helps blood clots form; and higher levels of fibrinogen could have helped the man's large clot to stay intact when it was coughed up. Even though the man had no further episodes of coughing up blood, he unfortunately died a week later from complications of heart failure.
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Clin Cancer Res. A retrospective analysis of delays in the diagnosis of lung cancer and associated costs. Clinicoecon Outcomes Res. Techniques in Vascular and Interventional Radiology. Internal Medicine. Cleveland Clinic. Coughing up blood. Updated January 9, Pediatric Pulmonology. Yendamuri S.
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