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About the procedure Sentinel Lymph Node Biopsy for Melanoma

Our Philosophy on Sentinel Lymph Node Biopsy

At AR Plastic Surgery, sentinel lymph node biopsy (SLNB) is used when needed to help assess the stage of melanoma, especially in cases considered intermediate to high risk. This procedure helps determine whether melanoma cells have started to spread beyond the original site and can assist in planning future care. SLNB is used for staging purposes only and is not a treatment for melanoma itself.

The surgeons who operate at AR Plastic Surgery have experience in performing SLNB in anatomically complex areas and work in collaboration with referring dermatologists, oncologists, and nuclear medicine specialists to ensure comprehensive melanoma care. The decision to proceed with SLNB is made in accordance with current evidence-based guidelines and is discussed with the patient in detail during pre-operative planning.

Our philosophy places strong emphasis on education and informed consent. Patients are provided with clear explanations of what SLNB involves, why it is recommended, and what information it may provide. The role of SLNB in the context of melanoma staging is explained thoroughly to support patient understanding and ensure realistic expectations regarding potential outcomes.

Understanding Sentinel Lymph Node Biopsy

Sentinel lymph node biopsy is a procedure used to identify and assess the first lymph node—or group of nodes—to which cancer cells are likely to spread from the primary melanoma. These nodes are called “sentinel nodes.” If melanoma cells are found in the sentinel node, it indicates that the cancer may have begun to spread beyond the original site.

SLNB is most often recommended for patients with melanomas that are:

  • 1.0 mm or greater in thickness, or
  • 0.8 mm to 1.0 mm in thickness with high-risk features such as ulceration or high mitotic rate.

 
It is typically performed at the same time as the wide local excision of the primary melanoma. The sentinel node is identified using a combination of radiotracer and dye injected near the melanoma site. These substances travel through the lymphatic system to the sentinel node, allowing the surgical team to locate and remove it for examination.

The sentinel node is then analysed by a pathologist for the presence of melanoma cells. The results help determine whether further treatment or monitoring is needed and guide follow-up surveillance strategies.

Patient Selection and Staging Considerations

Not every patient with melanoma requires SLNB. Suitability for the procedure depends on a range of factors, including:

  • Breslow thickness of the melanoma
  • Presence of ulceration
  • Anatomic location of the lesion
  • Patient age and general health
  • Preferences regarding the level of staging detail desired

 
SLNB is usually not recommended for patients with melanoma in situ, which means the melanoma is only in the top layer of the skin and has not spread deeper. It is also generally not advised for melanomas that are less than 0.8 mm thick and do not have features such as ulceration or rapid growth. In some cases, patients may decide not to have the procedure, especially if they have other health concerns or want to avoid the risks of lymph node surgery.

Patients who are being considered for SLNB have a detailed consultation before the procedure. During this appointment, the surgeon explains what the procedure involves, why it may be helpful, and what the results might show. The discussion also includes what happens next if melanoma is found in the sentinel node, such as whether more tests or treatment options will be discussed.

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What to Expect During the Day of the Procedure

Sentinel lymph node biopsy is usually done under general anaesthesia, which means the patient is asleep during the procedure. Before surgery, patients go to a nuclear medicine facility where a small amount of a special tracer is injected near the previous biopsy site. This tracer travels to the lymph nodes and helps identify the first node where cancer cells might spread, known as the sentinel node.

In the operating room, a blue dye may also be injected in the same area to help locate the sentinel node. The surgeon uses a small device to find the node and removes it through a small cut. One to three nodes may be removed, depending on how the tracer moves through the lymphatic system.

The wide local excision of the melanoma site is done during the same operation, using safety margins based on how deep the melanoma is. The removed tissue and lymph node are sent to a lab for examination. After the procedure, patients are monitored in recovery and given instructions about wound care, activity limits, and when to return for follow-up.

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Disclaimer: The outcomes shown are only relevant for this patient and do not necessarily reflect the results other patients may experience, as results may vary due to many factors, including the individual’s genetics, diet and exercise. Some images may have the patient’s tattoos, jewellery or other identifiable items blurred to protect patient identities.

Aftercare and Recovery

Recovery after sentinel lymph node biopsy can vary depending on the location of the node and whether additional procedures, such as a skin graft or flap, were required. Some patients may experience mild discomfort, swelling, or bruising near the biopsy site. These symptoms often improve with rest and appropriate care during the early healing period.

Patients are given clear instructions on how to care for the wound, including dressing care, bathing guidelines, and signs of possible complications. Physical activity may need to be limited, especially if the procedure involves the groin or underarms. Gentle movement is usually allowed, but activities that place strain on the surgical area should be avoided unless advised otherwise.

Temporary numbness, firmness, or swelling near the surgical site may occur and usually settle over time. Any ongoing or worsening symptoms should be discussed at follow-up. These appointments are also used to monitor healing and review the results of the node assessment. If no melanoma is found in the node, no further lymph node surgery is usually needed. If melanoma is present, further treatment options may be considered based on current guidelines.

Potential Risks

Sentinel lymph node biopsy carries risks, as with any surgical procedure. These should be considered and discussed before surgery. Potential risks include:

  • Infection
  • Bleeding or haematoma
  • Seroma (fluid collection)
  • Nerve injury or altered sensation
  • Wound healing issues
  • Anaesthesia-related complications
  • Lymphoedema (swelling caused by a build-up of fluid in the tissue)

Patients are informed about these risks during their consultation. They are given information about early signs to watch for, such as swelling or discomfort in the area. Management strategies and when to seek medical advice are also discussed.

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