A tree found in a man's lungs

In 2009, Russian doctors operated on Artyom Sidorkin to remove what they thought was a tumor in his lung. When they opened him up, they were surprised to find a fir tree growing instead! Doctors speculate that the man must have inhaled a seed that eventually sprouted and grew inside him. The growing branches were even started to cause him to cough up blood because they were puncturing his lungs!