When is a breast biopsy recommended for ductal carcinoma in situ?

Ductal carcinoma in situ, or DCIS, is made of abnormal cells confined to a milk duct. It may be suspected when mammography shows clustered or new calcifications, although other findings can look similar. A needle biopsy takes small samples for a pathologist to examine. The report can confirm whether DCIS is present and describe features such as the area sampled and the appearance of the cells. A biopsy recommendation does not by itself confirm DCIS.

Bring your imaging reports and a list of medicines to the appointment. Tell the team about blood-thinning medicines, allergies, and any difficulty lying in the required position. Ask whether stereotactic, ultrasound-guided, or another biopsy approach fits the location of the finding. Once the result is available, ask how it relates to the imaging and whether further tissue sampling or breast surgery is needed.

After biopsy, call the clinic for persistent bleeding, marked swelling, increasing warmth or redness, fever, or pain that is worsening. Seek urgent care for fainting, severe breathing difficulty, or bleeding that cannot be controlled. If your imaging result has not been explained or your pathology appointment is delayed, contact the breast team so the next step is clear.

What feature on the scan led to biopsy? Which biopsy method will sample it accurately? When will the pathology result be ready? If DCIS is confirmed, what other information will guide treatment? Could the result be benign or another type of breast change?