The “Numb” Reality of Mastectomy

For millions of women undergoing mastectomy (breast removal) for cancer treatment or prevention, the primary focus is survival. The secondary focus is often reconstruction—restoring the physical appearance of the breast.

However, there is a “silent” side effect that is rarely discussed but deeply felt: Numbness.

During a mastectomy, the sensory nerves that provide feeling to the breast skin and nipple are often cut.

A Little Background on Anatomy

To understand why numbness occurs, we must look at how the breast receives feeling. The sensory innervation to the breast originates from the medial and lateral cutaneous branches of the third to fifth intercostal nerves.

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• The Path of the Nerves: The third, fourth, and fifth intercostal nerves give off lateral cutaneous branches that pierce the chest wall (near the mid-axillary line, or the side of your rib cage). These branches divide into anterior and posterior parts, supplying the skin of the side and front of the chest.
• The Anterior Branches: The anterior cutaneous branches (the terminal parts of these nerves) supply the skin on the chest wall toward the center (sternum).
  • The 3rd nerve covers the upper-mid chest.
  • The 4th nerve covers the central chest and the medial (inner) breast area – The Nipple Line.
  • The 5th nerve covers the lower-mid chest and the inframammary fold (where the breast meets the ribs).

These nerves provide sensory innervation (known as dermatomes) to specific chest and abdominal areas and are crucial for sensation and pain management (such as nerve blocks).

For years, women have accepted that their reconstructed breasts, while looking beautiful, would permanently feel numb—like “wearing a bra made of your own skin.”

The Missing Link: Finding the Nerve

Restoring sensation (Resensation) is possible. Surgeons can perform a “nerve transfer,” connecting a nerve from your chest wall to the nerves in the reconstructed breast.

So, why isn’t this done all the time?

One major hurdle has been the difficulty of finding the right donor nerve. The human body is complex, and searching for a tiny nerve (often only 2 millimeters wide) during a long surgery can be like finding a needle in a haystack.

The Breakthrough: A Roadmap for Sensation

A pivotal study published in Plastic and Reconstructive Surgery has provided surgeons with a reliable “treasure map” to find these elusive nerves.

Research conducted by Dr. Rebecca Knackstedt and Dr. Risal Djohan (along with their team in Cleveland and Toledo, Ohio), utilized precise anatomical studies to identify the exact hiding place of the nerve responsible for breast sensation.

What They Found

The researchers discovered that the Lateral Intercostal Branch (the nerve key to breast feeling) is located in a highly predictable spot:

• It almost always exits from under the 4th Rib.
• It sits consistently near the edge of the Pectoralis Minor muscle.
• It travels safely underneath the thoracodorsal vessels (major blood vessels in the armpit area).

Why This Matters for Your Surgery

This study transforms a “search mission” into a precise procedure. Because surgeons now know exactly where to look, we can locate the nerve with much greater accuracy. The study identified the nerve’s location as:

• 10 to 15 cm from the sternum (breastbone).
• 8 to 16 cm from the mid-clavicular line.
• Near the lateral border of the armpit muscle (Pectoralis minor) or within 2 cm from it.

By using these precise coordinates, surgeons can:

1. Locate the nerve quickly, reducing surgery time.
2. Preserve the nerve more effectively.
3. Perform Nerve Allografts: Connect this sensation-carrying nerve to your reconstructed breast tissue using a nerve graft.

Moving Beyond “Looking Normal”

We believe that feeling whole means more than just looking in the mirror; it’s about feeling a hug, noticing a change in temperature, and reclaiming your body’s sensation.

Thanks to anatomical breakthroughs like this study from Ohio, Breast Neurotization (nerve repair) is becoming a more standard and successful part of breast reconstruction.

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Frequently Asked Questions (FAQ)

Q: If I have this procedure, will my sensation be 100% normal?

A: “Normal” is a strong word. Nerve regeneration is slow and complex. Most patients do not regain perfect, pre-surgery sensitivity. However, the goal is to transition from “numbness” to “protective sensation” (feeling touch and pressure) and, in many cases, erogenous sensation. It is a vast improvement over having no feeling at all.

Q: Does this add time to the surgery?

A: Yes, nerve repair does add some time to the reconstruction surgery. However, thanks to the “mapping” provided by this research, the time taken to find the nerve is significantly reduced, making the addition of nerve repair much more feasible.

Q: Can this be done if I had a mastectomy years ago?

A: Breast reinnervation is most successful when performed at the same time as the mastectomy (Immediate Reconstruction). Doing it years later is much more difficult because the nerve endings may have scar tissue or have become dormant. However, it is always worth discussing with your surgeon.

Q: Is this only for implant reconstruction or flap reconstruction?

A: Nerve grafts can be used in both. In DIEP Flap (using your own tissue), surgeons connect the chest nerve to the nerve in the tummy tissue. In Implant reconstruction, the nerve is connected to the remaining skin or nipple nerves.

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Reference

Knackstedt, Rebecca M.D., Ph.D.; Gatherwright, James M.D.; Cakmakoglu, Cagri M.D.; Djohan, Michelle M.S.; Djohan, Risal M.D. “Predictable Location of Breast Sensory Nerves for Breast Reinnervation.” Plastic and Reconstructive Surgery. February 2019. Cleveland Clinic & University of Toledo, Ohio.