After seven weeks of extensive testing, it has been determined that 2010 champion 2-year-old male Uncle Mo has a case of cholangiohepatitis, which, according to the Merck Veterinary Manual, is a "severe inflammation of the bile passages and adjacent liver, which sporadically causes hepatic failure in horses and ruminants."

Uncle Mo (photo taken June 6) has been recovering at WinStar Farm in Versailles, Ky. from a case of cholangiohepatitis.

According to a statement released June 3 by owner Mike Repole, the determination of what led to the early favorite for the Kentucky Derby to be withdrawn from the race came following a biopsy of the liver and lymph nodes. After being scratched from the Derby two days before the race, Uncle Mo was sent to WinStar Farm near Versailles, Ky., where he underwent extensive testing by some of the top equine internists in the country