Gallbladder Polyp on Ultrasound: What Does It Mean and What Happens Next?

A gallbladder polyp is a small growth or deposit attached to the inner lining of the gallbladder. Most are found by chance on an ultrasound done for another reason, most cause no symptoms and most are not cancerous. What happens next depends mainly on the polyp's size, its shape and your own risk factors.

The gallbladder is a small pouch under the liver that stores bile. This guide is general education for adults who have been told about a polyp on a scan. It cannot tell you what your polyp is or which plan is right for you.

A polyp found by chance is rarely an emergency, but gallbladder problems such as gallstones can cause sudden illness. Do not wait for a planned follow-up scan if new symptoms appear.

The NHS advises urgent medical advice the same day for tummy pain lasting longer than 30 minutes. Call your local emergency number or go to an emergency department if you have:

• Sudden, severe tummy pain.
• Pain that spreads from your tummy to your back, with being sick.
• A very high temperature, or feeling hot, cold or shivery.
• Yellow skin or yellowing of the whites of your eyes (jaundice).

Usually not. When symptoms do occur, Cleveland Clinic lists pain that comes and goes in the upper right tummy, feeling sick or vomiting, fever if there is inflammation, and difficulty digesting fatty foods. Jaundice is possible but rare.

Gallstones can also cause upper tummy pain, so it can be hard to know whether a polyp is responsible. Tell your clinician exactly when pain started, how long it lasts and what seems to trigger it.

Cleveland Clinic explains that about 70% to 90% of gallbladder polyps are pseudopolyps, sometimes called 'false polyps'. The most common type is a cholesterol polyp, made of small cholesterol deposits stuck to the lining, which is not cancerous. Adenomyomatosis, a thickening of the wall with tiny pouches, and inflammatory polyps are other pseudopolyps.

True polyps are growths of cells. The commonest type is an adenoma. Adenomas are mostly not cancerous but can occasionally become cancer, which is why follow-up matters. Cancerous polyps are rare.

Ultrasound cannot always tell these types apart. The joint European guideline notes that a 'comet tail' or reverberation artefact on ultrasound suggests a pseudopolyp such as a cholesterol polyp, and its size-based advice does not apply to those. Not every pseudopolyp shows this sign, so ask how your report describes the lesion.

Yes. Size is one of the main features used to plan care, together with shape and risk factors. The 2021 joint guideline from four European societies (ESGAR, EAES, EFISDS and ESGE) bases its advice on ultrasound measurements and lists these risk factors for cancer: age over 60, primary sclerosing cholangitis (a bile duct disease), Asian ethnicity, and a sessile (flat or broad-based) polyp, including focal wall thickening over 4 mm. If there are several polyps, the largest guides the plan.

Its main size groups, for polyps that are not causing symptoms, are summarised below. Other countries and hospitals may use different rules, and the authors note the evidence is of low to moderate quality.

• 10 mm or larger: removal of the gallbladder is recommended if you are fit for surgery and agree.
• 6 to 9 mm with one or more risk factors: removal is recommended if you are fit and agree.
• 6 to 9 mm without risk factors: follow-up ultrasound at 6 months, 1 year and 2 years.
• 5 mm or smaller with one or more risk factors: the same follow-up scans at 6 months, 1 year and 2 years.
• 5 mm or smaller without risk factors: no follow-up is needed.

Under the European guideline, follow-up usually means a transabdominal ultrasound, the same kind of scan through the skin of the tummy. Your team will tell you whether to avoid eating or drinking beforehand.

Scans can stop after two years if the polyp has not grown, and monitoring can stop if the polyp disappears. If it reaches 10 mm, removal is advised. If it grows by 2 mm or more within the two years, the guideline suggests weighing its current size and your risk factors, often in a team discussion, to decide between more scans and surgery. Cleveland Clinic notes that some small cholesterol polyps shrink or become undetectable over time, while most polyps do not go away on their own.

Surgery means removing the whole gallbladder, called a cholecystectomy, usually by keyhole (laparoscopic) surgery. Besides the size and risk-factor situations above, the European guideline suggests surgery can be considered when a polyp may be causing symptoms and no other cause is found.

That guideline also advises counselling before surgery for symptoms, because many people still have pain afterwards. Ask what the operation is expected to achieve in your case, its risks, and what would happen if you chose monitoring instead.

Bring the full ultrasound report, not just a summary that says 'polyp'. These questions can help.

• What is the size of the polyp in millimetres, how many are there, and is it flat or on a stalk?
• Does the report suggest a cholesterol polyp or other pseudopolyp, or a possible true polyp?
• Do I have any risk factors that change the plan?
• Which guideline is being followed, and when is my next scan, if any?
• Who books the follow-up scan and tells me the result?
• What size or change would lead to a discussion about surgery?
• Could any symptoms I have be from the gallbladder, or from something else?

On SameCase, patients and verified doctors share de-identified cases. Reading how others with a similar-sized polyp described their reports, follow-up schedules and decisions can help you spot details to check in your own report and questions to raise.

Another person's case cannot show what your polyp is or which plan suits you. We suggest using similar cases to prepare for your appointment, not to replace your clinician's advice or delay urgent care.