Cancer Related Facial Paralysis
What is Cancer-Related Facial Paralysis?
Overview
Cancer-related facial paralysis occurs when cancer or its treatment damages the facial nerve, leading to weakness or complete loss of movement on one side of the face. The facial nerve (7th cranial nerve) is responsible for controlling the muscles that allow us to smile, frown, close our eyes, and perform other essential expressions and functions.
One of the most common sites where cancer can affect the facial nerve is the parotid gland, the largest salivary gland located in front of and just below the ear. The facial nerve travels directly through the parotid gland, which places it at risk during both tumor growth and surgical treatment.
When a tumor develops in or spreads to the parotid gland, surgery may be required to remove it. In cases of malignant tumors, a radical parotidectomy is often performed. This procedure involves removing the entire parotid gland as well as part or all of the facial nerve if it is invaded by cancer. Because the facial nerve is sacrificed in this surgery, facial paralysis on the affected side is inevitable.
Cancers that can involve the parotid gland include:
- Primary parotid gland cancers (tumors that start in the gland itself).
- Metastatic cancers that spread from other areas, most commonly skin cancers of the head and neck such as:
- Basal cell carcinoma
- Squamous cell carcinoma
- Melanoma
Facial paralysis in these cases can significantly affect appearance, speech, eating, eye protection, and overall quality of life.
Who is Affected?
Cancer-related facial paralysis can affect adults of any age, but it is most often seen in individuals who develop head and neck cancers. People at higher risk include those with:
- Primary parotid gland tumors, both benign and malignant, though paralysis is more commonly linked to malignant disease.
- Skin cancers of the face and scalp (such as squamous cell carcinoma, basal cell carcinoma, or melanoma) that spread to the parotid gland.
- Large or aggressive tumors in the parotid gland or surrounding areas that directly invade or compress the facial nerve.
- Patients undergoing radical parotidectomy or other cancer-related surgeries in which the facial nerve must be removed to ensure complete tumor clearance.
While less common, facial paralysis may also occur due to radiation therapy, tumor recurrence, or nerve damage during surgery for other nearby cancers.
Men and women are affected at similar rates, and risk increases with age, cumulative sun exposure, and a history of head and neck skin cancers.
Cancer-Related Facial Paralysis Symptomsrn& Causes
Symptoms
Symptoms include:
- Weakness or drooping: One side of the face may appear weaker or droop, affecting the ability to smile or close the eye on that side.
- Loss of facial expressions: The ability to make certain facial expressions may be impaired or lost.
- Difficulty eating and drinking: As the muscles controlling the mouth are affected, eating and drinking may become challenging.
- Speech difficulties: Changes in the muscles responsible for speech may lead to difficulties in articulation.
- Eye problems: The eye on the affected side may not close fully, leading to issues with eye protection and dryness.
Causes
Several factors can contribute to cancer-related facial paralysis.
- Tumor invasion: Cancerous tumors, particularly those affecting the head and neck region, can invade and damage the facial nerves directly.
- Radiation therapy: Radiation treatment for cancer in the head and neck area can damage healthy tissues, including the facial nerves, leading to facial paralysis.
- Compression: Tumors or swollen lymph nodes can exert pressure on the facial nerves, affecting their function.
- Surgery: Surgical procedures to remove tumors may inadvertently damage the facial nerves, leading to facial paralysis.
The parotid gland is one of the major saliva producing glands in the face. The facial nerve travels through the parotid salivary gland and is therefore at risk during surgery to remove tumors of the parotid gland. Using special nerve monitors, the facial nerve is typically preserved. However, in cases that involve malignant tumors where the gland and nerve are both affected, a radical parotidectomy is performed.
A radical parotidectomy is a complex procedure that involves purposefully removing part of the facial nerve along with the entire parotid gland. In cases where the risk of cancer spread is high, it may also include neck dissection to remove lymph nodes that are involved.
When radical parotidectomy is performed there is 100% certainty that a patient will develop facial paralysis and significant contour deformity immediately after surgery. Therefore, in radical parotidectomy-related facial paralysis, the best time to perform reconstruction with facial reanimation is simultaneously. If this is not possible, it is essential that you speak with an expert in facial reanimation immediately after to create a plan to manage the paralysis and facial deformity.
Patients undergoing radical parotidectomy may or may not have facial paralysis before surgery. If there is facial paralysis in part or over the entire face prior to surgery, it is extremely important to ensure that the eye is protected to prevent vision loss.
Facial nerve paralysis immediately after radical parotidectomy will include the following:
- Complete facial paralysis
- Inability to blink or close the eye
- Inability to smile
- Inability to chew food properly on the paralyzed side
When to See a Doctor
You should seek medical evaluation as soon as you notice any new weakness, drooping, or loss of movement on one side of the face. Unlike temporary causes of facial weakness (such as Bell’s palsy), cancer-related facial paralysis usually does not improve on its own and requires prompt medical attention.
Signs that warrant seeing a doctor include:
- Sudden or progressive drooping of the mouth, eyelid, or cheek.
- Difficulty smiling, closing the eye, or raising the eyebrow.
- Asymmetry in facial expressions.
- Pain, swelling, or a lump near the jaw, ear, or cheek.
- History of skin cancer on the face or scalp with new facial weakness.
Early evaluation is especially important if you have a known parotid gland tumor or a history of head and neck skin cancer, as facial paralysis may signal tumor involvement of the nerve.
If symptoms develop suddenly or worsen quickly, prompt medical care can help identify the cause and determine the most effective treatment options.
Cancer-Related Facial Paralysis Diagnosis
Diagnosing cancer-related facial paralysis involves determining both the cause of the facial nerve weakness and the extent of tumor involvement. A thorough evaluation is essential to guide the most appropriate treatment plan. Accurate diagnosis helps distinguish cancer-related facial paralysis from other causes (such as Bell’s palsy, trauma, or infection) and ensures that treatment is tailored to both tumor control and facial function.
Clinical Evaluation
- Medical history & physical exam: A head and neck specialist will review when the weakness began, how quickly it progressed, and any prior history of cancer, skin lesions, or surgeries.
- Neurologic and facial function testing: The degree of facial paralysis is assessed, often using grading systems such as the House–Brackmann scale, which measures the severity of facial weakness.
Imaging Studies
- MRI scans: Provide detailed images of the facial nerve, parotid gland, and surrounding tissues to assess tumor size, spread, and nerve involvement.
- CT scans: Helpful for evaluating bony structures and detecting tumor invasion into adjacent areas such as the skull base.
- PET scans: May be used to look for metastatic spread from other cancers.
Biopsy
- Fine needle aspiration (FNA) or core biopsy of a parotid or skin lesion is often performed to confirm the diagnosis and determine whether the tumor is malignant or metastatic.
Additional Tests
- Electromyography (EMG) and nerve conduction studies: Sometimes used to evaluate the degree of nerve damage and potential for recovery.
- Dermatologic exam: To check for suspicious or recurrent skin cancers on the face or scalp that may have spread to the parotid gland.
Cancer-Related Facial Paralysis Treatment & Outcomes
Treatment Options
Treatment options for cancer-related facial paralysis may include the following to manage symptoms and improve the patient’s quality of life. The specific approach depends on the underlying cause, the extent of nerve damage, and the overall treatment plan for the cancer.
- Surgery to repair or graft nerves
- Physical therapy
- Supportive measures
For patients undergoing radical parotidectomy, our expert facial reanimation surgeons recommend simultaneous reconstruction of both the facial nerve and parotidectomy defects. This includes sophisticated nerve reconstruction using grafts taken from other parts of the body (i.e. sensory nerves such as the sural nerve, or motor nerves such as the nerve to vastus lateralis muscle).
These can be used to connect the proximal and distal nerve stumps. In addition, nerve transfers using nearby nerve branches may also be performed (i.e. nerve to masseter or hypoglossal nerve).
Since it takes at least 3-6 months for the nerve grafts to begin working, our facial reanimation surgeons also perform tendon transfers/slings that can help to achieve symmetry immediately after surgery and movement of the lower face/smile in as little as 6 weeks. Often this can be done in combination with the nerve transfers at the time of surgery.
Lastly, in select patients, complex microvascular reconstruction can also be performed using vascularized fat from the thigh to repair the soft tissue defect left after removal of the entire parotid gland.
Immediately after surgery, it is also important to protect the eye and prevent visual loss. This involves using a moisture chamber, artificial tears, and lubrication. After a few weeks, once the swelling has resolved, we recommend brow lifting, upper eyelid weighting, and lower eyelid tightening.
Delayed treatment for facial paralysis related to radical parotidectomy varies. This is based on the length of time since paralysis onset/surgery, whether or not radiation was performed after surgery, and if the patient has any other medical conditions that affect their overall health.
In some cases, patients may be eligible for immediate reconstruction that is similar to acute repair of radical parotidectomy defects.
However, if the paralysis occurred more than 1 year prior and the health of the facial nerve and muscles are in question, other options may be recommended. Based on patient history, physical exam, and diagnostic testing, our expert facial reanimation surgeons will create a unique patient specific treatment plan for you.
Example treatments may include:
Patient Outcomes
Outcomes for patients with cancer-related facial paralysis depend on the type and stage of cancer, the extent of facial nerve involvement, and the treatment approach. When the facial nerve must be removed to fully clear the tumor, permanent facial paralysis is expected. However, many patients benefit from reconstructive procedures, such as nerve grafting, muscle transfers, or static suspension techniques, which can help restore facial symmetry and improve quality of life.
With advances in microsurgery, radiation therapy, and rehabilitation, patients are achieving better functional and cosmetic results than ever before. Long-term outcomes also depend on the underlying cancer — for example, early treatment of skin cancers that spread to the parotid gland often has a better prognosis than aggressive or late-stage tumors.
Ongoing physical therapy, speech therapy, and eye protection strategies are also critical for maintaining comfort, safety, and quality of life.
Managing Cancer-Related Facial Paralysis
Management of cancer-related facial paralysis involves a multidisciplinary approach to address both the cancer itself and the resulting facial weakness. At every stage, care is personalized to help patients regain confidence, improve appearance, and restore daily function. Treatment may include:
Cancer Treatment
Surgery, radiation, chemotherapy, or immunotherapy depending on the tumor type and stage.
Facial Reanimation Surgery
Nerve grafts, nerve transfers, or muscle transplants may restore movement in some cases.
Static Procedures
Techniques such as eyelid weights or slings can improve facial symmetry and protect the eye.
Rehabilitation
Physical therapy and speech therapy help patients adapt and improve function.
Supportive Care
Strategies to manage dry eye, drooling, and difficulties with eating or speaking.
Meet our Expert Specialists & Surgeons
Experience Compassionate, Expert Care
Our team at Pacific Neuroscience Institute (PNI) includes world-renowned neurosurgeons, head and neck cancer specialists, plastic and reconstructive surgeons, and rehabilitation experts who collaborate to deliver advanced, compassionate care. Our patients benefit from:
- Specialized expertise in complex head and neck cancer surgery and facial reanimation.
- Leading-edge technology including high-resolution imaging, intraoperative nerve monitoring, and microsurgical techniques.
- Multidisciplinary collaboration across oncology, neurosurgery, plastic surgery, and rehabilitation for comprehensive care.
- Personalized treatment plans focused on cancer control, facial function, and quality of life.
Our commitment to compassionate, patient-centered care is reflected in consistently strong outcomes and heartfelt testimonials from patients who have regained confidence and function.
Learn More About Cancer-RelatedrnFacial Paralysis
The prognosis depends on the type and stage of the underlying cancer, as well as the extent of facial nerve involvement. When the nerve is removed, paralysis is usually permanent, but reconstructive surgery and therapy can restore function and quality of life. Early detection and treatment of cancer improve overall survival and outcomes.
Yes. Tumors that grow in or spread to the parotid gland, or cancers directly involving the facial nerve, can lead to paralysis. Facial paralysis may also result from surgical removal of tumors.
Skin cancers such as squamous cell carcinoma, basal cell carcinoma, and melanoma can spread to the parotid gland and affect the facial nerve. Primary parotid gland cancers and some rare head and neck tumors can also cause facial paralysis.
Symptoms include weakness or drooping on one side of the face, difficulty closing the eye, asymmetry in smiling or frowning, facial numbness, and sometimes pain or swelling near the ear or jawline.
Although rare, lymphoma in the head and neck region can involve the facial nerve and lead to paralysis.
Survival rates depend on the type of cancer, stage at diagnosis, and response to treatment. For example, early treatment of localized skin cancers that spread to the parotid often has favorable outcomes, whereas aggressive or late-stage cancers may have a more guarded prognosis.
Resources
Get Expert Care from Leading Specialists
If you or a loved one is facing cancer-related facial paralysis, our team at Pacific Neuroscience Institute is here to help. With advanced surgical expertise, innovative facial reanimation techniques, and a compassionate, multidisciplinary approach, we are dedicated to restoring both health and quality of life. Contact us today to schedule a consultation with our expert surgeons and specialists.
Written and reviewed by:
The Pacific Neuroscience medical and editorial team
We are a highly specialized team of medical professionals with extensive neurological and cranial disorder knowledge, expertise and writing experience.
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