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Health condition

Parotid tumour, the facial nerve, and how surgeons plan around it.

Most lumps in the parotid gland are benign. The diagnosis and the surgery both turn on one thing - the facial nerve running straight through it.

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A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Editorial team

    Written by our editorial team from the UK sources listed on each page.

  • 02

    Sourced from guidance

    Checked against NICE NG12 and peer-reviewed head and neck sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK guidance on urgent referral, imaging and specialist commissioned parotid surgery.

Key facts

Parotid tumour at a glance.

The essentials, in plain English - what it is, why the facial nerve matters, and how it’s treated in the UK today.

  • What it is

    A lump within the parotid, the largest salivary gland, sitting in front of and below the ear.

  • How common

    The parotid is the most frequent site for a salivary gland tumour of any kind, benign or malignant.

  • Usual behaviour

    Most parotid lumps are benign - pleomorphic adenoma is the most common, Warthin tumour the second most common.

  • Malignant minority

    A smaller proportion are cancerous, including mucoepidermoid carcinoma and adenoid cystic carcinoma among others.

  • Key anatomy

    The facial nerve runs directly through the gland, which shapes both diagnosis and every surgical decision.

  • Mainstay treatment

    Parotidectomy - superficial or total, with facial nerve preservation wherever oncologically appropriate.

Why this guide matters

One nerve shapes every decision.

Parotid tumours are common and usually benign - but the anatomy makes both diagnosis and surgery more specialised than for other lumps.

  • Most lumps are benign

    Pleomorphic adenoma is the most common parotid tumour and Warthin tumour the second most common - both usually treatable with surgery alone.

  • The facial nerve runs through the gland

    This single fact drives the imaging, the biopsy approach and the entire surgical plan, for benign and malignant tumours alike.

  • A minority need cancer-specific care

    Mucoepidermoid carcinoma, adenoid cystic carcinoma and other malignant types need specialist commissioned MDT input and sometimes radiotherapy.

How the diagnosis is made

From first lump to a clear surgical plan.

The steps a UK GP and head and neck team will normally follow, in order - so you know what to expect and why.

  1. 01

    Noticing

    Painless swelling noticed

    A lump in front of or below the ear is the most common presentation, whether the tumour turns out benign or malignant.

  2. 02

    Noticing

    Urgent GP assessment

    Per NICE NG12, an unexplained parotid lump warrants urgent referral for suspected head and neck cancer.

  3. 03

    Noticing

    Check for concerning features

    Rapid growth, pain, facial nerve weakness, skin fixation or ulceration all raise suspicion of malignancy.

  4. 04

    Confirming

    Ultrasound first

    Ultrasound is the first-line imaging test, assessing the lump's size, position and character within the gland.

  5. 05

    Confirming

    Tissue sampling

    Fine-needle aspiration cytology or core biopsy gives a tissue diagnosis before any decision on surgery is made.

  6. 06

    Planning

    MRI for surgical planning

    MRI maps the tumour's relationship to the facial nerve and plans the extent of parotidectomy required.

  7. 07

    Planning

    Head and neck MDT discussion

    A specialist commissioned head and neck or salivary gland multidisciplinary team agrees the definitive management plan.

Typical timeline: urgent referral to a settled surgical plan within a few weeks.

Symptoms

What a parotid tumour actually looks like.

A slow, painless swelling is the classic presentation. And the features that mean it’s time to escalate.

  • Painless swelling

    A slow-growing lump in front of or below the ear - the most common presentation of both benign and malignant disease.

  • Rapid growth

    A lump that enlarges quickly over weeks rather than months is a feature that raises suspicion of malignancy.

  • Pain

    Most benign parotid lumps are painless - new pain in or around the gland deserves prompt reassessment.

  • Facial nerve weakness

    Any weakness or asymmetry of the face on the affected side is a red flag the nerve may be involved by tumour.

  • Skin fixation or ulceration

    Tethering to or breaking through the overlying skin suggests advanced, locally invasive malignant disease.

  • Neck lump or lymphadenopathy

    A firm lump in the neck alongside the parotid swelling may indicate regional lymph node spread.

  • Deep lobe involvement

    A tumour extending into the deep lobe can bulge into the throat and cause a feeling of fullness or muffled speech.

  • Red flag - rapid growth with weakness

    Rapid growth combined with facial nerve weakness is the combination that most strongly suggests cancer.

Treatment

How parotid tumours are treated in the UK.

Surgery with facial nerve preservation is the mainstay for both benign and malignant tumours, with radiotherapy reserved for higher-risk cancers.

  • Superficial parotidectomy

    Removal of the lobe overlying the facial nerve - the standard operation for tumours confined to the superficial portion of the gland.

  • Total parotidectomy

    Removal of both lobes when a tumour involves or lies close to the deep lobe, still aiming to preserve the facial nerve where possible.

  • Facial nerve monitoring

    Intraoperative nerve monitoring helps the surgeon identify and protect the facial nerve as it runs through the operative field.

  • Facial nerve preservation

    Preserving the nerve is the default aim for both benign and malignant tumours, sacrificed only when oncologically necessary.

  • Nerve reconstruction

    If the nerve must be sacrificed for malignant clearance, grafting or reanimation surgery can restore some facial movement.

  • Adjuvant radiotherapy

    Used for malignant tumours with high-risk features - close or involved margins, nerve invasion or higher-grade histology.

  • Facial rehabilitation

    Physiotherapy and, where needed, further reconstructive input support recovery of facial function and appearance after nerve surgery.

  • MDT specialist follow-up

    Ongoing head and neck surgery and oncology review, with imaging surveillance tailored to tumour type and margins.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist head and neck society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or head and neck surgeon knows your case and history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE. Suspected cancer: recognition and referral (NG12).

  • British Association of Head and Neck Oncologists (BAHNO). Head and neck cancer standards.

  • Royal College of Surgeons of England. Salivary gland surgery guidance.

  • National Cancer Institute. Salivary gland cancer treatment overview.

Red flags

When a parotid lump needs urgent attention.

Most parotid lumps are benign and manageable through routine referral. These are the features that change the urgency.

  • Facial nerve weakness

    New weakness or asymmetry of the face on the side of the lump strongly suggests nerve involvement by malignancy and needs urgent review.

  • Rapid lump growth

    Enlargement over days to weeks, rather than months or years, is a classic marker of aggressive tumour behaviour.

  • Skin fixation or ulceration

    A lump tethered to or breaking through the skin points to locally advanced malignant disease requiring urgent specialist assessment.

  • New pain in the gland

    Most benign parotid tumours are painless, so new or worsening pain deserves rapid reassessment rather than reassurance.

  • Neck lymphadenopathy

    A new firm neck lump alongside the parotid swelling may indicate regional metastasis and changes the urgency of referral.

  • Numbness of the face or ear

    Sensory change over the cheek, jaw or ear can accompany nerve or adjacent tissue involvement and should be reported promptly.

  • Difficulty opening the mouth

    Trismus suggests deep infiltration of the tumour into surrounding muscle and warrants urgent MDT discussion.

  • Bloodstained saliva or discharge

    Any blood-tinged discharge from the parotid duct is unusual and should prompt urgent specialist assessment.

  • Voice or swallowing change

    A deep lobe tumour bulging into the throat can affect speech or swallowing and needs prompt head and neck review.

Living with it

A treatable condition, with a clear surgical path.

Four things that make the biggest difference before and after surgery - understanding the nerve risk, expecting some numbness, keeping follow-up appointments and asking for rehabilitation support.

A quiet reminder

Most people recover their facial movement fully.

Even when the nerve is stretched or bruised during surgery, function often returns over weeks to months.

  1. 01 Before surgery

    Understand the nerve risk

    Ask your surgeon directly about the chance of temporary or permanent facial weakness - it varies with tumour size and position.

  2. 02 Recovery

    Expect some numbness

    Numbness around the ear and jaw after parotidectomy is common and usually settles over weeks to months.

  3. 03 Follow-up

    Attend every review

    Even benign tumours are followed up, since pleomorphic adenoma can recur years later if incompletely removed.

  4. 04 Support

    Ask about facial rehabilitation

    If the nerve was affected, physiotherapy and specialist input can meaningfully improve movement and confidence.

Frequently asked

Everything we get asked about parotid tumours.

Quick answers on diagnosis, the facial nerve, surgery and recovery.

  • What is a parotid tumour?

    A lump arising within the parotid gland, the largest of the salivary glands, sitting in front of and below the ear. The parotid is the most common site for a salivary gland tumour, and most turn out to be benign.

  • Is a parotid lump usually cancer?

    No - the majority of parotid tumours are benign. Pleomorphic adenoma is the most common type overall, and Warthin tumour is the second most common. A minority are malignant, including mucoepidermoid carcinoma and adenoid cystic carcinoma.

  • Why does the facial nerve matter so much here?

    The facial nerve runs directly through the parotid gland, so any surgery must carefully identify and, wherever oncologically appropriate, preserve it. This anatomical relationship shapes both the diagnostic workup and the surgical plan.

  • What tests will I need?

    Ultrasound is used first to characterise the lump, followed by fine-needle aspiration cytology or core biopsy for a tissue diagnosis. MRI is then used to plan surgery and assess whether the tumour is close to the facial nerve.

  • What does treatment involve?

    Surgery - superficial or total parotidectomy - is the mainstay for both benign and malignant tumours, with facial nerve preservation the default aim. Malignant tumours with high-risk features may also need radiotherapy after surgery.

  • What symptoms mean I should be seen urgently?

    Rapid growth, pain, facial nerve weakness, or skin fixation and ulceration over the lump are the features that suggest malignancy and warrant urgent referral under NICE NG12.

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