I was able to attend the Vasculitis Symposium in Jacksonville and was surprised at learn some new testing that is being done with 3d printers and a persons own stem cells to rebuild a replacement trachea. It is presently being tested but sounds amazing with what could be possible in the future.

Here is a link to an article about what is being done
http://www.nydailynews.com/life-styl...icle-1.1589497