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How to treat breast and extramammary paget's disease 
Undergo breast-conserving surgery if you don't have a lump. 
If you have paget's disease but do not have a lump, you may be able to undergo a surgery that saves the breast. Your nipple and areola will be removed, but the breast will remain intact.
You may also need to get surrounding tissue removed near the nipple area. Get a mastectomy if you have a tumor.