DCIS in medical terms

Clinicians may call it DCIS or stage zero breast cancer. The key word is ‘in situ,’ meaning the cells remain in their original place behind the duct boundary.

‘Ductal’ identifies the milk ducts where the abnormal cells are located. ‘Carcinoma’ identifies abnormal epithelial cells with cancer-like features. ‘In situ’ distinguishes DCIS from invasive carcinoma, in which cells have crossed the duct wall into surrounding breast tissue.

A pathology report may also describe nuclear grade, cell death called necrosis, hormone-receptor status, and whether DCIS reaches an edge of removed tissue. These details help plan local treatment; no single word should be interpreted apart from the complete report.

Review the biopsy and mammogram findings with a breast specialist. The team considers where the DCIS lies, how much of the breast it involves, its grade, and whether breast-conserving surgery can remove it with clear margins.

Treatment commonly centres on surgery. Radiotherapy may be discussed after lumpectomy, and hormone therapy may be considered when the abnormal cells carry hormone receptors. Mastectomy may enter the conversation when DCIS is extensive or occurs in separate areas where conservation is not suitable.

DCIS is often detected on breast imaging rather than through a symptom. Even so, promptly report a new lump, nipple discharge containing blood, nipple pulling inward, or new dimpling or thickening of breast skin.

Following a procedure, urgent assessment is appropriate for difficulty breathing, heavy bleeding that does not settle with pressure, or rapidly expanding swelling. Fever, increasing redness, wound drainage, and pain that is getting worse also warrant prompt contact with the treatment team.

Ask your specialist to show where the report confirms that disease is in situ, explain the grade and receptor results, and describe what the imaging suggests about its extent. If surgery has already occurred, ask whether the margins are clear and whether another procedure is being considered.