Gallbladder polyp

What is a gallbladder polyp?

A gallbladder polyp is a small growth sticking out from the inner lining of your gallbladder. They are found in up to 6% of adults and are usually discovered by accident during routine imaging.

Doctors categorize these growths by what they are made of and their size:

• Cholesterol polyps: the most common type (60% to 70%). These are harmless deposits of cholesterol that carry zero cancer risk.

• Inflammatory polyps & adenomyomatosis: non-cancerous tissue overgrowths caused by long-term gallbladder irritation.

• Adenomatous polyps: true benign growths that have the potential to turn into cancer over time, making them the most critical type to monitor.

• Gallbladder cancer: can sometimes look exactly like a polyp on initial scans, which is why any new growth must be carefully checked.

Why size matters: Size is one of the most important factors when assessing a gallbladder polyp, but management also depends on its appearance, growth over time, and individual risk factors.

Polyps 5 mm or smaller may not require follow-up when no additional risk factors are present. Polyps measuring 6–9 mm are generally monitored with ultrasound, although surgery may be considered when additional risk factors are present. Polyps 10 mm or larger generally warrant specialist assessment and, in appropriate cases, surgical removal of the gallbladder (cholecystectomy).

Symptoms of gallbladder polyps

The vast majority of gallbladder polyps cause no symptoms and are discovered entirely incidentally on imaging. When symptoms occur they are typically caused by coexisting gallstones rather than the polyp itself:

• Mild upper right abdominal discomfort or fullness

• Nausea, particularly after fatty meals

• Biliary colic if coexisting gallstones cause intermittent outlet obstruction

Symptoms specifically attributable to a gallbladder polyp alone are uncommon. The clinical significance of a polyp lies almost entirely in its malignancy risk rather than in the symptoms it causes.

What causes gallbladder polyps?

The cause differs between polyp types. Contributing factors include:

• Excess biliary cholesterol is the primary cause of cholesterol polyps, the most common type. The same metabolic factors driving cholesterol gallstone formation, including obesity, dyslipidaemia, and insulin resistance, promote cholesterol deposition in the gallbladder wall.

• Chronic gallbladder inflammation from coexisting gallstones promotes inflammatory polyp formation through repetitive mucosal irritation.

• Adenomatous transformation arises from benign neoplastic proliferation of gallbladder epithelial cells, following a similar pathway to colorectal adenomatous polyps. The precise trigger is not fully understood.

• Gallstones are present alongside gallbladder polyps in a significant proportion of cases and are independently associated with increased malignancy risk when coexisting with a polyp.

• Primary sclerosing cholangitis is associated with significantly increased gallbladder polyp malignancy risk, warranting more aggressive management thresholds in affected patients.

• Age polyp prevalence increases with age, and the malignancy risk of a given polyp increases in older adults.

• Genetic factors including familial adenomatous polyposis are associated with gallbladder adenomatous polyp formation.

How is a gallbladder polyp detected?

Gallbladder polyps are detected through abdominal imaging, with blood tests assessing liver and biliary function and the metabolic conditions most closely associated with their formation.

Abdominal MRI Elfcare’s full body MRI can identify a gallbladder polyp as part of routine imaging, giving you an early heads-up if one is present. From there, ultrasound is the standard tool used to monitor a polyp's size over time and guide the right next step, whether that's periodic monitoring or referral for surgical removal.

Blood tests assess liver and biliary function and identify the metabolic conditions most commonly associated with gallbladder polyp formation. Relevant markers in Elfcare's panel include:

• ALP and GGT assess biliary health and are elevated in chronic gallbladder inflammation and biliary obstruction

• Bilirubin elevated when biliary drainage is impaired by a large polyp or coexisting gallstones

• ALT and AST assess liver function relevant to the overall biliary health picture

• Total cholesterol, LDL, and triglycerides dyslipidaemia is closely linked to cholesterol polyp formation and provides metabolic context

• HbA1c and glucose diabetes and insulin resistance are associated with both cholesterol polyp formation and gallbladder dysmotility

• CRP reflects systemic inflammation relevant to chronic cholecystitis coexisting with polyps

Why early detection matters

Most gallbladder polyps are benign, but a small proportion may have malignant potential. Early identification allows the polyp's size, appearance, and growth to be monitored and helps determine whether further investigation or surgery is appropriate.

Following established management thresholds is important because larger or otherwise higher-risk polyps may warrant specialist assessment or removal. Early evaluation can therefore help identify concerning changes before they progress and ensure appropriate treatment when needed.

How Elfcare can help

Elfcare's full body MRI images the gallbladder directly as part of the standard abdominal sequence, identifying gallbladder polyps as an incidental finding. If a polyp is found, we arrange the appropriate ultrasound follow-up to track its size over time and guide whether monitoring or surgical removal is the right path.

Our blood panel covers ALP, GGT, bilirubin, liver enzymes, lipids, and metabolic markers, providing the complete biliary and metabolic picture alongside the structural MRI findings.

If our MRI or blood tests identify a gallbladder polyp or related biliary findings, we take care of further diagnostics or refer you to the appropriate specialist.