... I think you've got a tree growing in your lung!!
Saw this amazing news article today about Artyom Sidorkin, a 28 year old Russian chap who presented to his local hospital with agonising chest pain and hemoptysis (coughing up blood). Convinced that he had lung cancer, he was taken to x-ray which showed what appeared to be a tumor. Straight into surgery where a section of his lung was removed and biopsied.. to reveal a 5cm spruce tree!!
Apparently he had inhaled a seed which then took root in his lung and began to grow! Read the full story here: http://tinyurl.com/cng9pw
And here's a nice little picture!