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Head and neck biopsy

Salivary Gland Biopsy — and FNAC Explained

A lump in the jaw or below the ear is understandably frightening. In most cases the first test is a fine needle aspiration — a quick, low-risk procedure that draws cells from the lump without a cut. Because the facial nerve passes through the parotid gland, how the biopsy is done matters.

Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026

  • FNAC is usually first — A thin needle draws cells from the lump. No cut, no stitches, often no anaesthetic.
  • Facial nerve proximity is real — The parotid gland wraps around the facial nerve. Technique and ultrasound guidance matter here.
  • Most lumps are benign — The majority of parotid lumps are not cancer, though all need proper assessment.
  • Results take days, not hours — Pathology takes time to read. An indeterminate result does not mean something is wrong.
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For most salivary gland lumps, FNAC — a fine needle aspiration — is the first test. A thin needle draws cells from the lump without a cut. The facial nerve runs through the parotid gland, which is why technique and experience matter. Most results are benign.

Is FNAC or a core biopsy the right test for a salivary gland lump?

FNAC is the usual first test. A thin needle is passed into the lump and cells are drawn out for examination. No cut is needed, and most people manage with a surface numbing spray or nothing at all.

Core biopsy — where a slightly wider needle takes a small cylinder of tissue — is used when FNAC does not yield enough information, or when the lump's location makes a different approach safer. Your oncologist or radiologist will say which they recommend and why.

Ultrasound guidance is used for most parotid and submandibular biopsies. It allows the doctor to see the needle tip in real time, which improves both accuracy and safety.

Does a salivary gland biopsy carry a risk to the facial nerve?

The facial nerve — which controls movement on one side of your face — passes through the parotid gland, the large gland that sits in front of and below your ear. This is the most important anatomical fact about parotid biopsy.

FNAC carries very low risk to the facial nerve. The needle is thin and the procedure is brief. Serious nerve injury from FNAC is rare.

The nerve risk is higher with open surgical biopsy, which is exactly why doctors prefer to establish a diagnosis by needle first. If surgery is recommended later, your surgeon will explain what nerve monitoring and preservation measures they use.

What does a salivary gland biopsy usually show?

Most salivary gland lumps — in the parotid especially — are benign. The most commonly found benign tumour is a pleomorphic adenoma. Warthin tumour is another common benign finding, seen more often in older patients who smoke or have smoked.

A proportion of results are malignant. The type of malignancy matters. Salivary gland cancers vary considerably in behaviour — some grow slowly and respond well to surgery alone, while others need surgery combined with radiation.

Occasionally, FNAC returns an indeterminate result — meaning the cells sampled do not give a definitive answer. In that situation, a core biopsy or surgical removal may be recommended to reach a clear diagnosis.

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Terms you will hear at your appointment

FNAC
Fine needle aspiration cytology. A thin needle draws cells from the lump. The cells are examined under a microscope. No cut or stitches are needed.
Parotid gland
The largest salivary gland, sitting in front of and below each ear. The most common site for salivary gland lumps.
Submandibular gland
The salivary gland under the lower jaw, on each side. The second most common site for a salivary gland lump.
Pleomorphic adenoma
The most common benign salivary gland tumour. Not cancer, but usually removed surgically because it can change character over many years.
Core needle biopsy
A slightly wider needle that takes a small cylinder of tissue rather than individual cells. Used when FNAC does not give a clear result.
Cytology
The study of individual cells from a needle sample, as used in FNAC.
Histology
The study of a tissue section, as used in core biopsy and surgical specimens. Gives more structural detail than cytology.

What happens during a salivary gland FNAC

  1. You are positioned

    You sit or lie with your head turned slightly. The skin over the lump is cleaned.

  2. Anaesthetic if needed

    A numbing spray or cream may be applied. Many FNACs are done without any anaesthetic at all.

  3. Ultrasound probe placed

    The radiologist uses an ultrasound probe to locate the lump and to watch the needle tip in real time.

  4. The needle is passed

    A thin needle is guided into the lump. You feel a brief pressure or sting, lasting a few seconds.

  5. Cells are collected

    Gentle suction draws cells into the needle. The pass may be repeated once or twice for an adequate sample.

  6. A dressing is placed

    A small dressing covers the entry point. You can usually leave within 20 to 30 minutes.

  7. Sample goes to pathology

    Results typically take five to seven working days, though complex cases may take longer.

What patients ask before their biopsy

Will the biopsy be painful?

Most people describe FNAC as a brief sting or pressure lasting only a few seconds — generally less uncomfortable than a blood test. Some tenderness at the site may last a day or two. If you have significant pain after the procedure, or swelling that keeps increasing, contact your team rather than waiting for your next appointment.

Can I eat, drink, and take my medicines normally on the day?

For FNAC alone, you can usually eat and drink as normal before the procedure. If you take blood thinners such as warfarin, aspirin, or clopidogrel, tell your team in advance — they will advise whether any adjustment is needed. Do not stop any medication without that guidance, as stopping suddenly carries its own risk.

What if the FNAC result is indeterminate?

An indeterminate result means the cells sampled did not give the laboratory enough information to make a definitive call. It does not automatically mean cancer is present. The next step is usually a core needle biopsy, which takes a larger tissue sample, or surgical removal of the lump so the whole specimen can be examined. Your oncologist will explain which route suits your situation and what it is expected to answer.

Could the needle spread cancer cells to nearby tissue?

This concern is common and understandable. NCCN and ESMO guidance supports fine needle aspiration as a safe procedure with a very low risk of needle-tract seeding. For salivary gland lumps specifically, FNAC is recommended precisely because it avoids open biopsy in a site where the facial nerve is present. The benefit of a tissue diagnosis before surgery is considered to outweigh the theoretical seeding risk.

What happens if the lump turns out to be malignant?

If the result shows a malignancy, the next step is staging — usually imaging such as MRI, CT, or PET-CT — to understand the tumour's size and whether it has spread. Your oncologist and head-and-neck surgeon will then recommend a treatment plan. Salivary gland cancers vary widely in behaviour, and treatment is planned specifically for your tumour type and stage.

How soon after the result will I know what happens next?

Your team should discuss results with you as soon as they are available, usually at a follow-up appointment arranged at the time of the biopsy. If the result needs discussion at a multidisciplinary tumour board — common for complex or malignant findings — there may be a short wait for that meeting. You are entitled to ask when your result is expected and when the next conversation will happen.

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Common questions

Frequently asked questions

How long does a salivary gland FNAC take?

The needle procedure itself takes only a few minutes. Including positioning, ultrasound setup, and dressing, most people are done within 20 to 30 minutes. No observation period is usually needed after a straightforward FNAC, though your team will tell you if your situation is different.

Can a salivary gland lump be cancer if I have never smoked?

Yes. Salivary gland cancer occurs in people who have never used tobacco. Tobacco use is associated with Warthin tumour, a common benign finding, but most salivary gland malignancies are not strongly linked to tobacco in the way oral cavity cancers are. A lump that warrants biopsy should be biopsied regardless of your history.

Is FNAC done in a clinic or does it need a theatre?

FNAC is a clinic or outpatient procedure. It does not need a theatre, general anaesthesia, or an overnight stay. Ultrasound-guided FNAC is typically done in a radiology suite. Core needle biopsy under ultrasound is also usually outpatient, though this depends on the lump's location and your general health.

What is the difference between FNAC and a surgical biopsy?

FNAC draws individual cells using a thin needle, with no cut and no stitches. Surgical biopsy removes a piece of tissue through an incision and requires local or general anaesthesia. For salivary gland lumps, surgeons generally prefer FNAC first because it avoids the facial nerve risks that any open procedure near the parotid carries. Surgical biopsy is used when needle sampling has not given a clear result.

Do I need someone to drive me home after the procedure?

For FNAC alone, most people travel home on their own. If local anaesthetic injection is used, or if you are having a core biopsy, your team may advise arranging transport. Ask at your pre-procedure appointment so you are not caught unprepared on the day.

Is FNAC available at CION?

Yes. Ultrasound-guided FNAC and biopsy for head and neck lumps, including salivary gland lumps, are available at CION centres. Imaging such as MRI, CT, and PET-CT for staging is coordinated with partner imaging centres. Your care team will arrange the relevant investigations and explain the sequence.

Full index

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