What Are Salivary Gland Tumors?
Salivary gland tumors are abnormal growths that develop in the glands producing saliva, including the parotid, submandibular, sublingual, and minor glands lining the mouth and throat.
There are three pairs of major salivary glands. The parotid glands sit in front of each ear. The submandibular glands lie under the jaw. The sublingual glands rest beneath the tongue. Hundreds of minor salivary glands also line the lips, cheeks, palate, and upper airway.
Salivary gland tumors are uncommon overall. They make up roughly 3 to 6 percent of head and neck tumors.[8] The parotid gland is the most frequent site, but the proportion of malignant tumors rises in smaller glands. Tumors in the sublingual or minor glands carry a higher cancer risk than those in the parotid.[8]
More than 20 distinct tumor types are recognized. Pleomorphic adenoma is the most common benign type. Mucoepidermoid carcinoma is the most common malignant type.[2] Children can develop salivary gland tumors as well, though much less often than adults.[5][9]
Causes and Risk Factors
The exact cause of most salivary gland tumors is unknown. Research points to a mix of genetic changes, environmental exposures, and prior radiation as the main contributors.
Genetic Changes
Many salivary gland tumors carry specific gene rearrangements that drive tumor growth. A 2024 systematic review identified recurring fusions such as MYB-NFIB in adenoid cystic carcinoma, MAML2 rearrangements in mucoepidermoid carcinoma, and PLAG1 or HMGA2 alterations in pleomorphic adenoma.[2] These molecular fingerprints help pathologists classify tumors accurately and inform prognosis.
Prior Radiation Exposure
Radiation therapy to the head and neck, especially in childhood, increases the long-term risk of salivary gland tumors. The risk applies to both benign and malignant types and may surface decades after treatment.
Other Risk Factors
Age is the strongest demographic factor. Most adult cases occur after age 50. Smoking is linked to Warthin tumor, a benign parotid lesion. Workplace exposures to silica dust, nickel, and certain rubber-industry chemicals have been associated with higher risk in some studies, though the evidence is limited.[8]
Symptoms and Diagnosis
The most common symptom is a painless lump near the ear, jaw, or inside the mouth. Pain, numbness, facial weakness, or rapid growth suggest the tumor may be malignant.
Benign tumors often grow slowly over months or years. Patients may notice a small, firm, mobile bump that does not hurt. Malignant tumors are more likely to grow quickly, feel fixed to surrounding tissue, cause pain, or lead to weakness on one side of the face when the parotid gland is involved.[1] Skin changes, ulceration, or trouble swallowing are late warning signs.
Diagnosis usually starts with a physical exam and imaging. Ultrasound is often the first imaging test. MRI gives detailed soft-tissue views and is preferred for deeper or larger lesions. CT scans help when bone involvement is suspected.[1]
Fine-needle aspiration (FNA) cytology is the standard sampling technique. A thin needle removes cells from the lump for microscopic review. FNA is safe and accurate in most cases, but salivary gland cytology is technically demanding and certain tumor types overlap, leading to occasional misclassification.[4] When FNA results are uncertain, surgical biopsy or excision provides definitive tissue diagnosis.
- Painless lump near the ear, jaw, or inside the mouth
- Persistent swelling that does not resolve over several weeks
- Pain or numbness in the face or jaw area
- Weakness or drooping on one side of the face
- Difficulty swallowing or opening the mouth fully
- A growth that bleeds or ulcerates
Treatment Options
Surgery to remove the tumor is the primary treatment for nearly all salivary gland tumors. Radiation, and sometimes chemotherapy, may be added for malignant or aggressive cases.
Surgical Removal
For parotid tumors, the surgeon typically performs a partial or total parotidectomy while protecting the facial nerve, which runs through the gland. Submandibular and sublingual tumors are removed by excising the entire affected gland. Minor salivary gland tumors are removed with a margin of surrounding tissue.
Complete removal with clear margins is the goal. Incomplete removal of pleomorphic adenoma, the most common benign tumor, is associated with recurrence and a small risk of malignant transformation over time.
Radiation Therapy
Radiation may follow surgery for high-grade malignancies, large tumors, positive surgical margins, perineural invasion, or lymph node involvement.[6] Radiation alone is sometimes used when surgery is not possible due to tumor location or patient health. A 2023 systematic review of minor salivary gland cancers in the larynx and trachea reported that combined surgery and radiation produced better local control than surgery alone for advanced cases.[6]
Chemotherapy and Targeted Therapy
Chemotherapy plays a smaller role in salivary gland cancer than in other head and neck cancers. It is used mainly for metastatic disease or when surgery and radiation are not options. Targeted therapies based on tumor genetics are an evolving area. Drugs that target HER2, androgen receptor, or NTRK fusions show promise in selected tumor subtypes.[2]
Recovery and Aftercare
Most patients return to normal eating and speaking within two to four weeks after parotid or submandibular surgery, though full nerve recovery can take longer.
Initial recovery involves swelling, mild pain, and a surgical drain that is usually removed within a few days. Patients can typically resume light activity within a week. Stitches are removed at one to two weeks. Numbness near the incision is common and often improves over months.
Facial nerve weakness can occur after parotid surgery, especially with large or deep tumors. Most weakness is temporary and resolves within six months. Permanent weakness is uncommon when the nerve is preserved during surgery. Frey syndrome, in which sweating occurs on the cheek during eating, develops in some parotidectomy patients and can be managed with topical treatments or injections.
Follow-up after malignant tumors typically includes physical exams every three to six months for the first two years, then less frequently. Imaging is added based on tumor type and risk. Patients with adenoid cystic carcinoma need long-term surveillance because recurrence can occur many years after initial treatment.
Cost Factors
Costs for diagnosis and treatment of salivary gland tumors vary widely based on tumor type, location, and the procedures involved. In many cases, total costs span from a few thousand to tens of thousands of dollars.
Diagnostic costs typically include imaging (ultrasound, MRI, or CT), fine-needle aspiration, and pathology review. Imaging alone often runs from a few hundred to several thousand dollars depending on modality and facility. Surgical costs depend on whether the procedure is outpatient or inpatient, the gland involved, and whether nerve monitoring is used. Radiation therapy adds further cost when needed.
Insurance generally covers medically necessary diagnosis and treatment, including surgery, pathology, imaging, and radiation. Coverage details vary by plan. Patients should confirm in-network status for the surgeon, hospital, and pathology lab. Hospitals and academic centers often have financial counselors who can outline payment plans or financial assistance.
Costs vary by location, provider, and case complexity. Getting a written estimate before treatment helps avoid surprises.
Specialist vs. General Dentist for Salivary Gland Tumors
Any persistent lump in or around the mouth, jaw, or neck should be evaluated by a specialist. General dentists often spot these growths first, but diagnosis and treatment require specialized expertise.
An oral pathologist reviews tissue samples under the microscope to identify the specific tumor type. This step is critical because more than 20 salivary gland tumor types exist, and treatment differs sharply between them.[2][7] Immunohistochemical and molecular testing are often needed to reach a precise diagnosis.[7]
Treatment is performed by a head and neck surgeon, oral and maxillofacial surgeon, or otolaryngologist with experience in salivary gland surgery. Radiation oncology and medical oncology may be involved in malignant cases. A coordinated team approach produces the best outcomes for complex tumors. You can learn more about the role of these clinicians on the oral-pathology page.
Find an Oral Pathologist Near You
If your dentist or doctor has identified a lump in or around your salivary glands, an oral pathologist can help determine whether it is benign or malignant. Use our directory to find a board-certified oral pathologist in your area for accurate diagnosis and clear next steps.
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