The La Paz hospital said Wednesday in a one-sentence statement that the 51-year-old remains in intensive care and has also undergone a tracheotomy, a procedure it called common in cases like his.
The hospital said Ballesteros condition was evolving favorably.
Ballesteros underwent a 6 1/2 -hour operation Friday on the brain tumor and the hospital said the surgery went better than expected. The operation removed what remained of the tumor and reduced the swelling on his brain.
Ballesteros was admitted to the hospital Oct. 6 after briefly losing consciousness at Madrids international airport. Eight days later, a sizable part of the tumor was taken out.
Ballesteros tumor is an oligoastrocytoma, which affects cells that cover and protect the nerve cells in the brain and spinal cord. In an earlier operation, part of his skull was removed to allow room for the swelling brain to expand.
Ballesteros won the British Open three times and the Masters twice. He captured a record 50 tournaments on the European Tour before retiring last year because of a long history of back pain. He has since concentrated on golf course design.
Ballesteros revolutionized European golf. After the Ryder Cup was expanded to include continental Europe in 1979, he helped beat the United States in 1985 to begin two decades of dominance. He also captained Europe to victory in 1997 and teamed with Jose Maria Olazabal in one of the most formidable partnerships in Ryder Cup history.