Does breast biopsy treat ductal carcinoma in situ?

Ductal carcinoma in situ, often shortened to DCIS, means abnormal cells are contained within breast milk ducts in the sampled tissue. A core needle or vacuum-assisted biopsy can remove part, and occasionally much, of a small imaging abnormality, but it is performed to diagnose the area rather than to complete treatment.

The biopsy samples only part of the target area. The pathology report and breast imaging help show the grade of DCIS, the span of the abnormality and whether the findings agree with each other. Surgery is commonly discussed to remove the affected area and allow examination of more tissue. Radiotherapy or hormone-blocking medicine may also be considered in selected care plans.

A marker clip may remain at the biopsy site so the area can be located later. The clip is not a treatment and does not indicate that DCIS remains in exactly the same amount as before sampling.

Request a clear explanation of the pathology, including the grade and whether any invasive cancer was seen in the sample. Ask the clinician to show where the abnormality appears on imaging and explain whether the biopsy result accounts for that appearance. If the results do not match, additional sampling or surgery may be proposed.

Keep the biopsy wound clean and follow the service's instructions about dressings and activity. Do not interpret a smaller imaging finding after biopsy as proof that treatment is complete; the breast team needs to assess the entire set of results.

Call the biopsy service if the wound becomes increasingly red, hot or swollen, if discharge develops, or if you have fever or worsening pain. Persistent bleeding despite firm pressure also needs prompt advice.

Get urgent medical help for fainting, breathing difficulty or swelling that is enlarging quickly. Mild bruising and soreness can follow sampling, but the team should assess symptoms that are severe or moving in the wrong direction.

Ask how extensive the DCIS appears, whether the imaging and pathology are concordant, what treatment choices fit the location and your preferences, whether further tissue examination could change the diagnosis, and how follow-up imaging will be organised.