The patient had a pacemaker fitted due to a history of poor cardiovascular health, according to the New England Journal of Medicine.
It came from a 36-year-old man with end-stage heart failure who spat out the medical anomaly in one piece during a coughing fit in hospital.
Per the Atlantic, Wieselthaler said that the use of the pump requires anticoagulants to "make the blood thinner and prevent clots from forming", though that comes with the risk of uncontrolled internal bleeding.
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"A 36-year-old man was admitted to the ICU with an acute exacerbation of chronic heart failure".
The right bronchial tree consists of three segmental branches in the lung's upper lobe, two segmental branches in the middle lobe, and five segmental branches in the lower lobe.
"It's a curiosity you can't imagine".
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Wieselthaler told the publication that it was the man's blood medication that made the clot rubbery and able to survive the trip out his airway instead of breaking up, since blood clots are typically hard plugs of blood. These medications are what caused the patient's blood to eventually break out of the network and into the lower right lung-due to the clotting agents not being able to fix cracks in the system.
Despite the doctor's best efforts and the assistance of a ventrical device, the man died from heart failure a week later.
Bronchial tree clots (called casts) are actually relativelycommon but only in extremely rare cases do they emerge in such pristine condition.
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