Lobular carcinoma in situ is growth of abnormal cells in the breast
lobules (milk-producing glands).  It is a noninvasive cancer and will not
spread outside the breast (metastasize) unless it undergoes a
transformation to become invasive.  It is considered a sign of being at
high risk for developing breast cancer.

Women who are diagnosed with LCIS are usually followed with regular
breast exams and mammograms.  MRI screening may also be used.  
Tamoxifen or Evista are sometimes recommended, though these
medications can have side effects.  Bilateral prophylactic mastectomy is  
an option, but many surgeons consider it to be overly aggressive
treatment.
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Lobular Carcinoma In Situ (LCIS)
More about Carcinoma in situ.