Former U.S. President Bill Clinton has checked into a New York hospital in preparation for more surgery Thursday, this time to remove fluid and scar tissue from his left chest cavity.

Mr. Clinton said Wednesday he is not worried about his condition, a complication that doctors have described as uncommon but not high risk. Surgeons will drain fluid that has accumulated around the former president's left lung after his quadruple heart bypass operation last September.

He is expected to be in the hospital for three to 10 days, but doctors say they expect a full recovery.

The 58-year-old Mr. Clinton spent the day before his surgery playing in a charity golf tournament for tsunami relief in the southeastern state of Florida. He has told reporters he feels fine despite the condition, which causes some shortness of breath.

Some information for this report provided by AP and Reuters.