Cubs pitcher Kerry Wood has a partial tear in his right rotator cuff and will be out at least four weeks. Wood underwent an arthrogram at Northwest Memorial Hospital on Friday, and the exam ILWAUKEE, revealed the tear. The team said Saturday the options are conservative treatment or possible arthroscopic surgery on Wood's shoulder. A final decision hasn't been made on treatment. "My gut feeling is saying no surgery and strengthen it," Wood said. "I've still got to get more opinions."