DCIS Surgery and Localization in Breast Cancer Care

Ductal carcinoma in situ, commonly abbreviated as DCIS, is a non invasive form of breast cancer in which abnormal cells remain confined to the milk ducts. Because most DCIS lesions are detected through screening mammography and present as microcalcifications rather than a palpable mass, accurate preoperative localization is essential for successful surgery. This article explains what DCIS is, how it is treated surgically, and how modern surgical marker navigation supports clear margins in breast conserving surgery for DCIS.

What Is DCIS?

Ductal carcinoma in situ refers to abnormal cells inside a breast duct that have not spread beyond the duct wall into the surrounding tissue. DCIS is classified as stage 0 breast cancer and is considered a non invasive condition, although it can progress to invasive breast cancer if left untreated. In screened populations, DCIS accounts for roughly 20 percent of all breast cancer diagnoses.

For broader context on breast cancer, see What Is Breast Cancer. For an explanation of localization principles in general, see Breast Cancer Localization.

How DCIS Is Diagnosed

Most DCIS is identified on screening mammography, often appearing as clustered microcalcifications. Because these findings are usually too small to feel, diagnosis requires image guided biopsy, typically through a stereotactic or vacuum assisted procedure. A clip marker is commonly placed at the biopsy site so the lesion location remains identifiable on imaging if surgery is required. For more on this step, see Understanding Clip Marker Placement After Breast Biopsy.

Information from organizations such as the American Cancer Society outlines the typical diagnostic pathway from suspicious mammographic findings to a confirmed DCIS diagnosis.

Treatment Options for DCIS

Surgical treatment of DCIS generally involves either breast conserving surgery, often combined with radiation therapy, or mastectomy in selected cases. Adjuvant endocrine therapy may be considered depending on hormone receptor status. Treatment decisions are individualized and typically discussed in a multidisciplinary tumor board, taking into account lesion size, grade, location and patient preference. Clinical guidance summarized on resources indexed by the National Comprehensive Cancer Network reflects this individualized approach.

Breast Conserving Surgery for DCIS

Breast conserving surgery, also called lumpectomy, removes the DCIS along with a rim of surrounding healthy tissue. The procedure is preferred in many cases because it preserves the breast and offers cosmetic and psychological advantages, while achieving outcomes comparable to mastectomy when combined with radiation. For more, see Lumpectomy Procedure.

Mastectomy for DCIS

Mastectomy may be recommended for extensive DCIS, multifocal disease, or patients with specific contraindications to breast conserving surgery. The choice between breast conservation and mastectomy is highly individual.

The Role of Localization in DCIS Surgery

Because DCIS is usually non palpable, the surgeon cannot rely on touch to locate the lesion during surgery. Preoperative localization is therefore essential. A radiologist places a marker at the biopsy site under imaging guidance, and the surgeon uses this reference to identify and remove the target tissue.

Published research indexed on PubMed, including a large Dutch cohort of patients undergoing breast conserving surgery for DCIS, has shown that wireless marker based localization and wire guided localization can achieve comparable margin status and re excision rates. The flexibility offered by wireless techniques can simplify scheduling and improve the patient experience.

Margins in DCIS Surgery

Margin status is one of the most important predictors of local recurrence after breast conserving surgery for DCIS. Many guidelines recommend a margin of at least 2 mm for DCIS, which differs from the ink free margin standard used for invasive disease. Achieving adequate margins on the first attempt reduces the likelihood of a second surgery and can shorten the overall treatment timeline.

Precise preoperative planning, accurate marker placement and reliable intraoperative guidance all contribute to clear margins. For DCIS that extends over a larger area, including the entire region of microcalcifications in the resected specimen requires careful coordination between radiology and the surgical team.

Clinical Evidence for Surgical Marker Navigation

Recent published evidence supports the use of magnetic surgical marker navigation for the excision of non palpable breast lesions. A prospective monocentric study by Ceccato and colleagues, published in Scientific Reports in February 2025 (doi: 10.1038/s41598-025-88430-5), reported on the first 200 cases at two French cancer centers using the Pintuition® system. The study documented 100 percent lesion excision, a 9 percent re excision rate compared with a literature benchmark of 14.9 to 20.8 percent for wire guided localization, and significant improvement in operating theater planning. While the cohort focused on ultrasound visible lesions, the workflow and accuracy findings are relevant to the broader category of non palpable breast surgery, including selected DCIS cases. A summary is available in the clinical one pager.

Coordination Between Radiology and Surgery

Effective DCIS treatment depends on close collaboration between the radiologist who maps the lesion and the surgeon who performs the resection. Localization markers that can be placed in advance of surgery give the multidisciplinary team flexibility in scheduling and allow more time for surgical planning, which can be especially valuable in complex DCIS cases. For additional context on planning, see Preoperative Localization Planning in Breast Conserving Surgery.

How Sirius Medical Supports DCIS Surgery

Sirius Medical developed the Pintuition System® to support precise localization in breast conserving surgery, including procedures for DCIS. The Pintuition Marker® is a non radioactive magnetic marker placed under standard image guidance, and can remain in place until surgery without rigid timing constraints within the approved indication.

During surgery, the Pintuition System® provides real time distance and directional guidance to the marker, supporting accurate resection of the targeted DCIS area. For a broader view of how surgical marker navigation supports breast cancer care, see How Sirius Medical Oncology Medical Devices Support Breast Cancer Care.

Interested in Improving Surgical Localization?

Learn how Pintuition® can support precision, workflow efficiency and confidence in DCIS surgery and breast conserving procedures. Request a demo or explore the clinical overview for more information.

Disclaimer

This article is intended for informational purposes only and should not be considered medical advice. Clinical decisions should always be made by qualified healthcare professionals based on individual patient needs and current guidelines.