A man who died later surrendered doctors by adjusting a six-inch-wide blood cotton of his lungs into the almost perfect form of his right bronzebrush.
The mysterious, cherry-casting looks like a piece of coral and a picture of it was alive after appearing in the New England Medical Journal.
It came from a 36-year-old man with an unsuccessful heart failure that exploded the medical anomaly in one piece while a cough in a hospital.
The doctors who treat the patient were "amazed" after they drained the cotton to find it, preserved the shape of the lung road from which it came from.
Despite the best efforts of intensive care at the Medical Center of the University of California San Francisco, the man died a week later.
"We were stunned," the lung surgeon Georg Wieselthaler told The Atlantic of the cotton.
"There is curiosity that you can not imagine – I say, this is very very rare".
The image of the cotton was widely divided because of the same time as grotesque and fascinating, with mixed reactions.
The patient, who had a history of heart problems, was placed on oxygen and gave blood vessels to help circulate blood and prevent coating.
But blood finally penetrated into his lungs and after days of cough to smaller clones, the patient took hold of the famous, giving a new meaning to the phrase "united lungs".