cbsnews.com — (Credit: istockphoto.com) (CBS News) A 10-year-old girl made medical history when a vein created from her own stem cells was transplanted into her body to treat a life-threatening blockage. PICTURES: First lab-grown windpipe saves cancer patient The girl had a condition called hepatic portal vein obstruction in which there is a blockage in the vein that drains blood from the intestines and spleen to the liver.