Film critic Roger Ebert, who has been fighting a lengthy battle with cancer, re-entered the hospital Thursday, he announced on his Web site.

"I'll have another surgery, which I hope will solve some problems I've still been living with," the writes Chicago-based reviewer, 65. "I'll be in hospital for awhile (nothing like last time, I trust!)."

He adds: "I plan to return full-time as soon as possible."

In 2002, Ebert was first operated on to remove a malignant tumor on his thyroid gland. Additional operations were in 2003, on his salivary gland, and in 2006, to remove a cancerous growth in the same area.

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