The star, who collected 87 titles before knee and back problems forced him to retire last year, underwent major brain surgery earlier this month.
He was admitted to hospital and the brain tumour diagnosed on October 6, after he collapsed and briefly lost consciousness at Madrid airport.
The first operation was followed by a second round of surgery to ease a build-up of fluid on his brain after he took a turn for the worse.
Ballesteros won the British Open in 1979, 1984 and 1988 and became the first European to win the Augusta Masters in 1980, a title he repeated in 1983.
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