lumpectomy & mammosite & reduction

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I need reduction in a breast that is about to have a lumpectomy. the other breast was treated with lumpectomy & radiation 20 years ago and has shrunk. Should I use mammosite & lumpectomy, with reduction to follow later?  Does external radiation cause more shrinkage than mammosite? Is the outlcome for mammosite as good as external radiation?

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