Understanding Temporal Artery Biopsy
If your doctor suspects giant cell arteritis (GCA) — also known as temporal arteritis — one of the key tests may be a temporal artery biopsy (TAB). This is a minor surgical procedure where a small section of the artery at your temple is removed and examined under the microscope.
Why is this important? GCA is a type of blood vessel inflammation that can cause headaches, scalp tenderness, jaw pain, and vision changes. If it isn’t treated quickly, there’s a high risk of permanent sight loss. A biopsy remains the gold-standard test for confirming the diagnosis and guiding treatment.
Your doctor may recommend a TAB when your symptoms and test results raise concern for GCA, and histological confirmation is needed.
What Happens During the Procedure
- The skin at your temple is numbed with local anaesthetic.
- A small incision is made at the side of your forehead.
- A short segment of the artery (about 1–3 cm) is carefully removed.
- The incision is closed with delicate stitches and covered with a small dressing.
The whole process takes 30–45 minutes and is done as a day-case procedure, so you go home the same day. Stitches are usually removed after 7–10 days, although dissolvable stitches may sometimes be used.
Evidence and Best Practice
A TAB is supported in international guidelines as the most reliable way to confirm GCA.
- Accuracy – A positive biopsy is highly reliable, with a specificity close to 100%. Sensitivity ranges from 60–90%, meaning around 5–10% of biopsies may miss the disease (false negatives), often because of “skip lesions” (inflamed and non-inflamed sections alternating along the artery).
- Bilateral biopsies – Taking biopsies from both sides can increase diagnostic yield, adding an extra 3–14% positive diagnoses in some studies.
- Ultrasound – Modern vascular ultrasound can show the “halo sign” of GCA. This can spare up to 30% of patients from having a biopsy when results are precise. However, TAB remains essential if ultrasound is inconclusive or if histology is required for treatment decisions.
Important: If GCA is strongly suspected, treatment with steroids should begin straight away — even before biopsy results — to avoid delays that could risk vision.
Safety and Risks
A temporal artery biopsy is generally very safe and well-tolerated.
Most common effects:
- Mild pain or tenderness at the incision site
- Small bruising or swelling
- A minor scar, usually hidden within the hairline or a natural crease
Less common risks:
- Bleeding, infection, or wound breakdown
- Haematoma (a small collection of blood under the skin)
- A false negative result (5–10%), where the biopsy does not pick up GCA even if it’s present
Facial nerve injury:
The primary concern in TAB is the risk of affecting the frontal branch of the facial nerve, which helps lift your eyebrow.
- In one study, 1.25% of biopsy specimens contained part of the nerve.
- Around 4% of patients developed weakness of the forehead (frontalis dysfunction); in some, this lasted beyond 6 months.
- Other studies show most weakness is temporary and improves with time.
How risk is reduced:
- Careful planning of the incision away from the “danger zone” near the brow and orbital rim
- Keeping the dissection superficial to avoid deeper nerve branches
- Using ultrasound mapping to identify a safe artery segment if needed
- Considering biopsy of the parietal branch (further from the nerve) in selected cases
These steps make nerve injury uncommon while maintaining diagnostic accuracy.
Experience and Expertise
At RCG Health, temporal artery biopsies are carried out by consultant surgeon Mr Ricardo Camprodon, working closely with rheumatology and ophthalmology colleagues as part of a joined-up, multidisciplinary approach.
Procedures are performed with:
- Meticulous technique to minimise scarring and complications
- Adequate specimen length to maximise diagnostic accuracy
- Nerve-sparing approaches to protect facial function
- Seamless collaboration between specialities to ensure safe, timely diagnosis and treatment
What You Can Expect
- Before – Your symptoms and history are reviewed. The procedure is explained, including benefits and risks. If GCA is strongly suspected, steroids are started straight away — treatment is never delayed.
- During – The area is numbed with local anaesthetic, a small incision is made, and the biopsy is taken. The procedure usually lasts under an hour.
- Afterwards – You go home the same day with simple aftercare advice. Mild tenderness is common but usually settles quickly.
- Follow-up – Results are usually available within 1–2 weeks and are reviewed alongside your symptoms, blood tests, and any imaging.
Reassurance for Patients
A temporal artery biopsy is a minor, day-case procedure with an excellent safety record. It plays a vital role in confirming the diagnosis of GCA, guiding treatment, and helping to prevent vision loss.
You can feel reassured that:
- The procedure is quick and done under local anaesthesia.
- Most patients only notice mild tenderness and a discreet scar.
- Complications are rare, and careful technique keeps nerve injury uncommon.
- Even if the biopsy is negative, results are always considered alongside your symptoms, blood tests, and imaging.
- Crucially, treatment with steroids starts immediately when GCA is strongly suspected.
At RCG Health, our guiding principle is safe diagnosis, minimal discomfort, and peace of mind.
Frequently Asked Questions
Will I be asleep?
No. The biopsy is done under local anaesthetic. Sedation is not usually required.
Is it painful?
Other than a short sting with the anaesthetic, the procedure itself is not painful. You may feel some tenderness afterwards, which usually settles quickly.
How long does it take?
About 30–45 minutes. You go home the same day.
Will I have a scar?
Yes, but it’s usually small and hidden within a crease or the hairline.
What are the risks?
Minor bruising, swelling, or numbness are the most common. Facial nerve weakness happens in around 4% of patients but is usually temporary. Infection and bleeding are rare.
How accurate is it?
A positive biopsy is almost always correct. False negatives occur in 5–10%, but accuracy improves if both sides are biopsied or a longer segment is taken.
When will I get my results?
Typically, within 1–2 weeks. Your results are reviewed together with your symptoms, blood tests, and imaging before making treatment decisions.
