The most common place for thyroid cancer to spread is to the lymph nodes right around the thyroid and along the windpipe just below the thyroid. This area is called the central neck. Removing lymph nodes in this area to eradicate cancer is known as a "central neck dissection."
In some patients undergoing a thyroidectomy for cancer, a central neck dissection might be performed at the same time as the thyroidectomy. We do this because the lymph nodes in the central neck are a common site of recurrence of thyroid cancer. Removing these lymph nodes at the time of your thyroidectomy may reduce your risk of requiring another operation in the future.
A central neck dissection removes all the lymph nodes from the area just below your voice box (larynx) to the top of your breast bone. Removal of these neck lymph nodes will not impair your immune system’s ability to fight infections.
If you are undergoing a thyroidectomy, the central neck dissection will be performed through the same incision (located in a curve in the skin of the lower neck). If you have already had a thyroidectomy, the previous incision will be used for the neck
dissection, but the incision may need to be extended.
The operation usually takes 2 to 3 hours if you have previously had a thyroidectomy. If performed at the same time as a thyroidectomy, the central neck dissections adds about 30-60 minutes to the surgery time.
Care is taken to protect the nerves to the vocal cords as well as the parathyroid glands. Occasionally, this operation requires relocation of the two lower parathyroid glands. When this is necessary, the parathyroid glands are placed into a pocket in one of the muscles of the neck, where they begin to grow again and resume their function. This is known as a parathyroid autotransplant.
Occasionally, a thin plastic tube (drain) may be placed at the time of the surgery and will come out the skin below your collar bone. If placed, this drain will usually be removed prior to your discharge from the hospital.The scar from the procedure should fade over time. It is often less noticeable than patients expect since the incision is made along a natural crease in the skin of the neck.
Two main complications of a central neck dissection are as follows:
The lymph nodes in the central neck are very close to the nerves to the vocal cords (recurrent laryngeal nerves) which run under the thyroid gland on either side of the neck. Injury to one of these nerves can cause hoarseness due to a paralysis of the vocal cord. A permanent vocal cord paralysis occurs in about 1% of patients. Approximately 10-15% of patients will have mild hoarseness resulting from operating around the larynx, but this hoarseness is temporary, lasting days to months.
Approximately 15% of patients experience low calcium directly following a neck-dissection surgery. This can cause a feeling of numbness or “pins and needles” (similar to the sensation you experience when your hand “falls asleep” after you have slept in an awkward position). Low calcium can also lead to muscle spasms. However, only 2-5% of patients will need to take calcium supplements on a long-term basis.
If you have had a previous thyroidectomy and are undergoing a central neck dissection for cancer recurrence, there may be scar tissue from the previous operation. This may slightly increase the risk of both nerve injury and parathyroid problems as compared
to a central neck dissection performed at the same time as a thyroidectomy.
This information is provided by the Department of Surgery at the University of Colorado School of Medicine. It is not intended to replace the medical advice of your doctor or healthcare provider. Please consult your healthcare provider for advice about a specific medical condition.