A simple and effective alternative to wire localization. So far, it’s been used in over 250,000 localizations.1


The Marker Designed for Both Patients and Physicians

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Enables Placement Flexibility

Forget ‘day of surgery’ constraints associated with wire-guided localization, now you can choose when and where to place the Magseed® marker, decoupling radiology and surgery schedules.

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Ensures Reliable Implantation

Once in place, patients can simply forget about their Magseed® marker. It stays in place – whether it’s one day or a hundred days before surgery.2

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Facilitates Confident and Consistent Retrieval

The Magseed® marker is easy to find, whether it’s a shallow lesion or more than 10 cm deep in the breast, resulting in a 99.9% retrieval rate across all 10,000 patients in clinical trials.2

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Creates a Better Patient Experience

With the Magseed® marker, patients have been shown to feel less pain than using wires. They can return to normal daily life, reduce the number of visits to hospitals, decrease time spent in the hospital and eliminate delays to the operating room on the day of surgery. 3

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Allows Better Cosmetic Outcomes

As the seed is minimally invasive, smaller incisions and a broad array of oncoplastic techniques become possible – giving your patients better outcomes than they may have thought possible.4

Tiny Seed. Huge Impact.

See How It Works

Magseed® – See How it Works
Watch the Video to See how the Magseed® Marker Works
Simplicity of Magseed®
Watch the Video to Learn the Simplicity of the Magseed® Marker
Comparison of Wires vs. Magseed®
Watch the Video to Learn the Difference Between Wires and the Magseed® Marker
Patient Experience with Magseed®
Watch the Video to Learn About the Patient Experience with the Magseed® Marker
Patient Anxiety of Wires vs. Magseed®
Watch the Video to Learn About Patient Axiety of Wires vs. Magseed® Marker

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Why Magnetic Seeds?

Magnetic seeds have been designed to simplify breast cancer treatment, from the time the cancer is marked through to when it’s removed in surgery.

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Accurate Placement

With the choice of when and where to mark the cancer, you have ultimate control over placement.

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Firmly Implanted

Magnetic seeds won't move, break, or deactivate — no matter when they’re implanted.

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Pinpoint Detection

Detectable to the millimeter, magnetic seeds guide you to the tumor with precision.

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Accurate Removal

Being certain of the cancer’s location means you can remove it while leaving behind as much healthy tissue as possible.


Do I have to worry about the seed moving or breaking before surgery?

Unlike conventional guidewires, once a Magseed® marker has been placed, patients won’t be able to feel it and its special design means it will sit firmly implanted in the cancer. From the time it’s placed to the time of the surgery, it can’t be dislodged or broken.

Is the Magseed® marker composed of tiny magnets?

No, the Magseed® marker is made of medical grade stainless steel (low nickel) that becomes temporarily magnetized when the Sentimag® probe is near. This facilitates the ability to perform precision localization procedures.

Why is the Magseed® marker a better solution than traditional wire localization for breast cancer surgery?

The Magseed® marker can be placed days, weeks or months ahead of surgery to suit both you and your patients’ schedules. The procedure is simple and can often be completed in a matter of minutes. This flexibility means you don’t have to worry about additional procedures on the day of surgery affecting scheduling.

Sentimag® Localization Platform

Sentimag® Localization Platform

Four techniques in one platform allow for more surgical options than any other non-gamma localization system.


Magtrace® Lymphatic Tracer

Magtrace® Lymphatic Tracer

The Magtrace® Lymphatic Tracer is engineered to be uniform and small enough for rapid migration, yet large enough to be mechanically filtered by the sentinel lymph nodes.


HydroMARK™ Breast Biopsy Marker

HydroMARK Breast Biopsy Marker

The HydroMARK marker’s exclusive hydrogel technology provides clinicians with unmatched long-term ultrasound visibility.


XPERT® 40 Specimen Radiography System

XPERT® 40 Specimen Radiography System

When you need to identify fine details, in a wide range of specimens, in a short amount of time.


1. Data on file at Endomag
2. Gera, R. (2020) Evolving Role of Magseed in Wireless Localization of Breast Lesions: Systematic Review and Pooled Analysis of 1,559 Procedures. Anticancer Research
3. Kühn F, Simon CEE, Aliyeva I, KUßMAUL J, GROß J, Schweizerhof O, Blohmer JU, Karsten MM. A German Study Comparing Standard Wire Localization With Magnetic Seed Localization of Non-palpable Breast Lesions. In Vivo. 2020 May-Jun;34(3):1159-1164. doi: 10.21873/invivo.11888. PMID: 32354905; PMCID: PMC7279781.
4. Pieszko et al (2020) Evaluation of the Nonradioactive Inducible Magnetic Seed System Magseed for Preoperative Localization of Nonpalpable Breast Lesions – Initial Clinical Experience.

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