What is ductal carcinoma in situ (DCIS)?

Updated: May 24, 2018
  • Author: Peter Abdelmessieh, DO, MSc; Chief Editor: Marie Catherine Lee, MD, FACS  more...
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Ductal carcinoma in situ (DCIS) is noninvasive breast cancer that is limited to the inside of the ducts of the breast. Increased use of screening mammography has resulted in a dramatic increase in the detection of ductal carcinoma in situ (DCIS). Approximately 64,000 cases of DCIS are diagnosed annually in the United States. Ninety percent of DCIS cases are identified on mammography as suspicious calcifications, with a linear, clustered, segmental, focal, or mixed distribution.

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