A 36-year-old man suffering from chronic heart failure shocked the doctors when he spit out a blood clot at the end of November that was very similar to the bronchial tree in his right lung.

Georg Wieselthaler, a transplant and pulmonary surgeon at the University of California, San Francisco, told the Atlantic, "We were astonished. It's a curiosity you can not imagine – I mean, that's very, very, very rare. "

According to the New England Journal of Medicine, the man was an intensive care patient at San Francisco University Medical Center who was being treated for end-stage heart failure.

During the week of the patient's hospitalization, the man had periodic coughing fits that led to an extreme coughing fit when he suddenly released the unusual clot.

After the oxygen was delivered to him via a tube, the man's cough stopped two days later, which led to the removal of the tube. Although the coughing subsided, unfortunately, his health deteriorated.

Despite the physician's efforts and support for a ventricular device, the man died of heart failure a week later.

The information source in this article has largely been made available to an article in the New England Journal of Medicine.