The first patient to undergo a brain-to-brain transplant in the United States was discharged from the hospital Friday as scientists called the decision to perform the surgery with cells from an aborted fetus "courageous."

The 52-year-old Parkinson's disease patient was released from the University of Colorado Health Science Center, two days after surgeons implanted cells from the brain of the aborted fetus into his brain."He's doing well," said Dr. Curt Freed, a professor of medicine and pharmacology who headed the team that performed the experimental operation.

The nine-hour operation involved drilling a quarter-size hole in the Denver man's skull and repeatedly injecting the fetal cells into his brain in the hopes of correcting a chemical imbalance that has crippled him, Freed said.