Hard to say: At some point a cell in the breast becomes a cancer. How long this process takes depends. Dcis can exist for months, but left alone long enough can evolve into cancer. Screening mammography can detect very early cancers and dcis to allow curative treatment in a timely fashion. Most breast lumps found on physical exam or self detected by patients are readily evaluated by mammogram and ultrasound.
Answered 5/16/2013
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