Neck Dissection & Endolymphatic Sac Surgery — How It Works, Benefits & Recovery — Procedure Guide, Recovery & Risks | MyMedicPlus

This page covers two distinct ENT and head-and-neck surgical procedures that share an anatomical focus: neck dissection and endolymphatic sac surgery. Neck dissection is the surgical removal of cervical lymph nodes and surrounding tissue from defined anatomical levels of the neck, performed primarily as a staging and treatment procedure for squamous cell carcinoma of the head and neck, thyroid cancer, melanoma, and salivary gland malignancies. The extent of dissection ranges from selective removal of specific nodal levels to comprehensive radical dissection of all cervical structures. Endolymphatic sac surgery is a distinct inner ear procedure performed by otological surgeons for Meniere's disease — a condition caused by elevated endolymphatic pressure in the labyrinth producing episodic vertigo, sensorineural hearing loss, tinnitus, and aural fullness. The surgery aims to reduce endolymphatic hydrops by decompressing or shunting the endolymphatic sac, which lies on the posterior surface of the temporal bone. Both procedures require general anaesthesia and are performed in specialised ENT or head and neck surgical units by experienced subspecialty surgeons. This page covers two distinct ENT and head-and-neck surgical procedures: neck dissection (removal of cervical lymph nodes for cancer staging or control) and endolymphatic sac surgery (decompression or shunting of the endolymphatic sac for Ménière's disease). Neck dissection is the definitive surgical procedure for regional lymph node management in squamous cell carcinoma of the head and neck, thyroid cancer, and salivary gland malignancies. Radical neck dissection, introduced by Crile in 1906, has been progressively refined into modified radical and selective dissection variants that preserve functional structures while achieving adequate oncological clearance. Endolymphatic sac surgery, developed in the 1920s by Portmann, targets the endolymphatic sac in the posterior cranial fossa to reduce endolymphatic hydrops responsible for Ménière's disease symptoms. Both procedures are performed by otolaryngologists and head-and-neck surgeons or otoneurological surgeons respectively, and require general anaesthesia and intraoperative neural monitoring.

Neck dissection is indicated for patients with squamous cell carcinoma of the oropharynx, oral cavity, hypopharynx, larynx, or thyroid with clinical or radiological evidence of cervical nodal metastases, or electively for cancers with a high risk of occult nodal spread (greater than fifteen to twenty percent). Selective neck dissection removing only the at-risk nodal levels (commonly levels I–III for oral cavity, or levels II–IV for laryngeal cancers) balances oncological adequacy with preservation of function. Radical neck dissection, which removes the sternocleidomastoid muscle, internal jugular vein, and spinal accessory nerve, is performed when these structures are directly invaded by tumour. Endolymphatic sac surgery is considered for patients with disabling Meniere's disease who have not achieved adequate vertigo control after at least six months of conservative management including a low-sodium diet (below 1,500 mg per day), diuretics (hydrochlorothiazide–triamterene), vestibular suppressants, and intratympanic corticosteroids. It is preferred over destructive procedures (labyrinthectomy, vestibular nerve section) when useful residual hearing is present and the surgeon wishes to preserve cochlear function. Patients must have a confirmed diagnosis of Meniere's disease according to AAO-HNS criteria.

Neck dissection begins with general anaesthesia. The skin is incised in a planned pattern that provides access to the relevant neck levels while allowing reconstruction. The surgeon dissects through the platysma muscle and, using loupe magnification, carefully removes the specified nodal compartments in continuity with their surrounding fibroadipose tissue. The spinal accessory nerve (cranial nerve XI), the internal jugular vein, and the sternocleidomastoid muscle are preserved in modified radical and selective dissections. Critical structures including the carotid artery, vagus nerve, phrenic nerve, and thoracic duct (on the left) are identified and protected throughout. Haemostasis is achieved and suction drains are placed before layered closure. Endolymphatic sac surgery is performed through a postauricular incision with the patient under general anaesthesia. A complete mastoidectomy exposes the posterior fossa dura. The endolymphatic sac is identified on the posteroinferior surface of the temporal bone, lateral to the sigmoid sinus. In decompression surgery, the bony covering over the sac is removed to allow it to expand. In shunting procedures, a small silicone tube or valve is inserted into the sac to drain endolymph to the subarachnoid or mastoid space. Both neck and sac surgeries require intraoperative neural monitoring in appropriate cases. Neck dissection begins with general anaesthesia and careful positioning with the head turned to expose the operative neck. The skin is incised in a planned pattern providing access to the relevant nodal levels while allowing reconstruction. The surgeon dissects through the platysma and identifies the sternocleidomastoid muscle (SCM), internal jugular vein (IJV), and accessory nerve (CN XI) — structures preserved in functional neck dissection. Lymph node-bearing fatty tissue is removed level by level (I–V for radical, or selective levels for targeted dissection). In modified radical dissection, the SCM, IJV, or CN XI may be sacrificed if invaded by tumour. Endolymphatic sac surgery proceeds via a post-auricular incision and mastoidectomy, followed by identification of the sigmoid sinus and posterior fossa dura. The endolymphatic sac is decompressed (removed bony covering), incised (sac-tomy), or shunted into the mastoid or subarachnoid space. Intraoperative facial nerve monitoring protects CN VII throughout both procedures.

Neck dissection provides essential staging information — the number, size, and extracapsular extension of involved lymph nodes are the most important prognostic factors for head and neck cancer survival — and achieves regional disease control by removing macroscopic and microscopic nodal metastases. Selective neck dissection spares the spinal accessory nerve, sternocleidomastoid muscle, and internal jugular vein, preserving shoulder function and cosmetic appearance while achieving oncological control equivalent to radical dissection in most N1 and N2 disease. Regional failure rates after selective neck dissection for appropriately staged squamous cell carcinoma are below ten percent when combined with adjuvant radiotherapy as indicated. For endolymphatic sac surgery, observational data and controlled studies report vertigo control (greater than fifty percent reduction in vertigo episodes) in sixty-five to eighty percent of patients at two years of follow-up. Most patients experience a reduction in attack frequency and severity, allowing improved daily function and reduced dependence on vestibular suppressant medications. Hearing preservation rates are superior to those of destructive procedures such as labyrinthectomy, making it the preferred initial surgical option when cochlear function is worth preserving. Tinnitus and aural fullness show more variable improvement, with meaningful benefit in forty to fifty percent of patients.

Neck dissection carries several significant procedure-specific risks. Injury to the spinal accessory nerve — even with preservation attempts — may cause shoulder weakness, drooping, and chronic pain in five to twenty percent of patients, particularly after extensive dissection in levels II–V. Chyle leak from injury to the thoracic duct on the left side or right lymphatic duct occurs in one to two percent of left neck dissections and may require dietary modification, pressure dressings, or re-exploration. Internal jugular vein thrombosis or facial oedema may occur with bilateral simultaneous jugular vein ligation. Marginal mandibular nerve injury causing lower lip weakness and hypoglossal nerve injury causing tongue deviation are uncommon but possible during level I dissection. Wound haematoma (two to three percent) and infection are general surgical risks managed with drainage and antibiotics. Endolymphatic sac surgery risks include sensorineural hearing loss worsening (five to ten percent), persistent or new tinnitus, perilymph fistula, facial nerve injury (rare with experienced surgeons), cerebrospinal fluid leak, and meningitis. The most significant limitation is that vertigo improvement may not be sustained beyond three to five years in twenty to thirty percent of initially responsive patients, necessitating further management.

After neck dissection, patients are admitted to the surgical ward for two to five days. Suction drains are removed when output falls below thirty millilitres per day, typically at two to three days. Shoulder physiotherapy begins early to prevent stiffness from spinal accessory nerve handling, and structured shoulder rehabilitation exercises continue for six to twelve weeks. Oral feeding resumes within twenty-four hours in most cases. The skin incision heals over two to three weeks, with suture removal at seven to ten days. Patients requiring adjuvant radiotherapy begin treatment six to eight weeks after surgery. Regular oncological follow-up with clinical examination and imaging (CT or PET-CT) is scheduled at three-monthly intervals for the first two years, then six-monthly thereafter. After endolymphatic sac surgery, hospital discharge typically occurs at one to two days. Balance disturbance and dizziness are expected in the first one to two weeks as the inner ear adjusts; vestibular exercises accelerate compensation. Strenuous activity, swimming, and air travel are avoided for four to six weeks. Audiological review at six weeks assesses hearing status. Patients are advised that full assessment of vertigo control requires three to six months of follow-up as the effect of surgery takes time to manifest.