Bryan Stow, the San Francisco Giants fan who was beaten outside Dodgers Stadium in March, has been moved to a rehabilitation facility in the Bay Area.

Dr. Geoff Manley (Jeff Chiu / AP)

“Bryan has been an extremely challenging patient,” said Dr. Geoff Manley, chief of neurosurgery at San Francisco General Hospital. “It has been a roller coaster, but he is young and strong and has made tremendous advances.”

Stow, in photo released by hospital, is surrounded by staff and Dr. Geoff Manley (left). (AP)

Louie Sanchez, 29, and Marvin Norwood, 30, have been charged in the attack, which police say was the last of a series of confrontations with randomly selected Giants fans. They’ve pleaded not guilty to charges of mayhem, assault by means likely to produce great bodily injury, and battery with serious bodily injury.

“Where he will end up, we still don't know,” Manley said, via sfgate. “Only time will tell. We still don't know enough about traumatic brain injuries.”