Neck Dissection: What It Is and What to Expect

If you've been diagnosed with head and neck cancer, there's a good chance your surgeon has mentioned a neck dissection — either as part of your planned treatment or as a possibility depending on what other tests show. For many patients, this is one of the more intimidating-sounding aspects of the operation. The phrase itself sounds significant. It is significant, but it is also one of the most commonly performed and well-established procedures in head and neck cancer surgery, and understanding what it actually involves goes a long way toward reducing the anxiety around it.

Why the Neck Matters So Much in Head and Neck Cancer

The lymph nodes in the neck serve as the primary drainage system for most head and neck cancers. When a cancer — a tonsil cancer, an oral cavity cancer, a thyroid cancer, a salivary gland tumor — develops in this region, the lymph nodes of the neck are the first place that cancer cells tend to spread. Depending on the type and location of the primary tumor, a patient may arrive with enlarged, cancer-positive lymph nodes already visible or palpable. In other cases, the neck appears completely normal on physical examination and imaging — what we call a “clinically negative” or N0 neck — but the risk of microscopic cancer cells already being present in those nodes is substantial. For many oral cavity cancers, the rate of hidden or occult nodal disease in an apparently normal-looking neck is approximately 20–25%. That means treating the neck — even when it looks clean — is often the right decision.

A neck dissection addresses this directly. It removes the lymph nodes at risk, both to treat existing disease and to provide the pathologist with critical information about how far the cancer has spread. The results of the neck dissection directly influence decisions about whether additional treatment — radiation, chemotherapy, or both — is needed after surgery.

What Is Actually Removed

The neck is divided into anatomical levels — numbered Level I through Level V — that correspond to different groups of lymph nodes running from beneath the chin down into the lower neck and behind the sternocleidomastoid muscle. A neck dissection removes the lymph nodes from some or all of these levels, depending on where the primary tumor is located and the likelihood of spread to each region.

The type of neck dissection performed reflects how much of the neck is addressed and which structures are preserved.

A selective neck dissection removes only the lymph node levels that are statistically at highest risk based on the primary tumor site. For example, a cancer of the oral tongue typically spreads first to Levels I, II, and III, so those three levels would be dissected while the others are left alone. Selective neck dissection is the most common approach for early-stage disease and for elective treatment of the clinically negative neck.

A modified radical neck dissection removes all five levels of lymph nodes — essentially the entire neck — but preserves the three important non-lymphatic structures that run through the neck: the spinal accessory nerve (which controls shoulder movement), the internal jugular vein, and the sternocleidomastoid muscle. This approach is used when more comprehensive nodal dissection is needed but these structures can be safely preserved.

A radical neck dissection removes all five levels along with the spinal accessory nerve, internal jugular vein, and sternocleidomastoid muscle. This operation is now rarely performed — reserved for situations where cancer has directly invaded these structures and they cannot be safely left behind. The functional trade-offs, particularly the loss of the spinal accessory nerve, are significant, and preserving these structures whenever oncologically safe to do so is a central goal of modern neck dissection surgery.

What the Operation Involves

A neck dissection is performed under general anesthesia. The incision is placed in a natural skin crease of the neck, which allows it to heal well and become far less visible over time than most patients anticipate. The operation takes anywhere from one to three hours depending on which levels are being dissected and whether additional procedures are being performed at the same time (such as removal of the primary tumor or reconstruction).

At the conclusion of the dissection, a small surgical drain — a thin silicone tube connected to a suction bulb — is placed in the neck. This drain removes any fluid that accumulates as the tissue heals. You will go home with this drain in place, and most patients have it removed in the office within two to seven days once the output drops to an appropriate level. I will teach you how to manage the drain at home before you’re discharged; it is simpler than it sounds.

Most patients who undergo neck dissection alone — without additional major reconstruction — stay in the hospital one to two nights. When the neck dissection is combined with removal of a larger oral cavity tumor or free flap reconstruction, the hospital stay will be longer.

Recovery: What to Expect

The incision heals quickly in the majority of patients. The scar will be pink and somewhat firm at first, but it tends to fade and soften substantially over the first several months. Many patients are surprised at how inconspicuous it becomes.

Numbness is nearly universal after neck dissection, and it is worth being prepared for it. The greater auricular nerve — a sensory nerve that provides feeling to the lower cheek, the earlobe, and the skin behind the ear — are sometimes divided or stretched during the dissection because it runs directly through the operative field. After surgery, you will notice numbness or altered sensation in the skin of the lower face and ear on the side of the operation. For most patients, this improves meaningfully over six to twelve months as nearby nerves take over partial sensation, but some degree of permanent numbness is common and expected. Other transverse cervical nerve branches provide sensation to the neck skin, and these cross the incision in the skin, and make certain parts of neck skin permanently numb.

Shoulder function is the more functionally important concern. The spinal accessory nerve controls the trapezius muscle, which is responsible for elevating and rotating the shoulder. When this nerve is preserved — as it is in the vast majority of modern neck dissections — most patients experience some degree of temporary shoulder weakness or altered mechanics, particularly when lifting the arm overhead. This is primarily due to nerve handling and devascularization during the dissection itself, not division of the nerve, and typically improves over weeks to months. Physical therapy exercises targeting the trapezius and rotator cuff are an important part of recovery, and I routinely recommend early physical therapy for patients who develop shoulder symptoms.

The neck itself will feel stiff and tight after surgery. Range of motion in the neck improves steadily over the first four to six weeks. Most patients are significantly more comfortable within two weeks and return to light activity in the first week or two, though return to strenuous physical activity or heavy lifting takes longer.

Understanding Your Pathology Results

After surgery, the lymph nodes removed during the neck dissection are carefully examined by a pathologist. The report will tell us how many nodes were found, how many contained cancer, and whether the cancer has broken through the capsule of the lymph node into the surrounding tissue — something called extranodal extension. This information is critical: it is one of the primary factors that determines whether adjuvant radiation therapy, and in some cases chemotherapy, is recommended after surgery. Waiting for and understanding this pathology report is one of the most important steps in the postoperative period, and I make a point of reviewing these results in detail with every patient.

A Note on What Neck Dissection Is Not

A neck dissection is not the same as a carotid endarterectomy or vascular surgery. The major blood vessels of the neck — the carotid artery and the internal jugular vein — are carefully identified, preserved, and protected throughout the dissection. The goal is to remove lymphatic tissue around these structures, not to touch the vessels themselves unless tumor directly involves them. Modern imaging and intraoperative technique make inadvertent injury to major vessels exceptionally rare.

If You Are Facing a Neck Dissection

The prospect of surgery on the neck understandably causes anxiety. It is one of the more anatomically complex regions of the body, and patients are right to want to know what they’re getting into. My aim is always to have this conversation fully before the operating room — explaining exactly what will be done, which structures will be preserved, what the drain will look like, and what the first few weeks of recovery involve.

If you have been diagnosed with a head and neck cancer and need a surgical evaluation, or if you’d like a second opinion before proceeding with treatment, I am happy to see you. You can reach our office at 414-649-3920.

Dr. Steven Sperry is a fellowship-trained head and neck surgeon specializing in head and neck cancer surgery and microvascular free flap reconstruction at Aurora St. Luke’s Medical Center in Milwaukee, Wisconsin.