Li Fu, a 37-year-old Chinese man from Yunnan Province, fought through 4 years of chronic migraines and other debilitating neurological symptoms after he was stabbed in the head during a robbery in 2006. Only 4 years later did doctors perform an X-ray and realize that he had a 4 inch knife embedded in his skull.
http://news.asiaone.com/News/Latest%2BNews/Asia/Story/A1Story20110217-264042.html
It's Interesting 