Summary:
- Most gallbladder polyps are benign and do not become cancerous.
- Risk of cancer in a polyp increases with the size of the polyp.
- Gallbladder cancer is often detected incidentally during scans or surgery.
Gallbladder cancer is uncommon, and polyps rarely reach that stage. But when cancer does develop, it usually begins without symptoms and is only picked up incidentally on scans.
So how do polyps fit into this, and when do they become a concern?
Understanding Gallbladder Cancer
To understand when a polyp becomes a concern, it helps to first look at how cancer forms in the gallbladder and what changes happen at a cellular level.
How Gallbladder Cancer Develops
Gallbladder cancer typically develops over time, often as a result of repeated irritation to the gallbladder lining.
- Chronic Irritation of the Gallbladder Lining
This usually begins with ongoing inflammation (cholecystitis), which may be caused by:
- Gallstones irritating the gallbladder wall
- Bile stasis
- Chronic infections or rare conditions
Over time, this persistent irritation alters how the lining behaves.
- Changes in the Cells
With continued inflammation, the cells lining your gallbladder may begin to change:
- Metaplasia: Cells adapt and change type
- Dysplasia: Cells become abnormal and disorganised
There are no clear symptoms at this stage, though some growths may appear as polyps. Most are harmless, but a smaller group may represent these early abnormal changes.
- Early Cancer Formation (Carcinoma in Situ)
Abnormal cells may eventually become cancerous, but remain confined to the inner lining. It is difficult to detect at this stage because symptoms are minimal or absent.
- Invasion Into Deeper Layers
As the condition progresses, it grows into deeper layers of the gallbladder and may extend to nearby structures, such as the liver or bile ducts. At this stage, symptoms may begin to appear.
- Spread (Late-Stage Disease)
Cancer may then spread:
- To nearby organs (such as the liver)
- Through lymph nodes
- To distant parts of the body
This is when gallbladder cancer becomes more difficult to treat.
Difference Between Benign and Malignant Polyps
Most gallbladder polyps are benign, commonly related to cholesterol deposits within the gallbladder lining. These do not arise from abnormal cell changes and do not progress to cancer.
A smaller group of polyps may be pre-cancerous or cancerous. These are typically adenomatous in nature and are more closely linked to the earlier stages of abnormal cell development described above.
The distinction is not something you can feel, and it’s not always clear on a single scan. Hence, we interpret polyps based on:
- Whether they behave like a stable, incidental finding; or
- Whether they show features that suggest underlying cellular change
At Nexus Surgical, we look at how the polyp behaves — whether it stays the same, grows, or develops concerning features — to decide whether monitoring or surgery is more appropriate. Book a consultation with us.
How Gallbladder Cancer Is Usually Detected
Gallbladder cancer is often not detected through regular screening, but through related findings. It’s usually identified in one of three ways:
- Incidentally During Scans
You may undergo an ultrasound for abdominal pain or suspected gallstones, and an unexpected finding is seen, such as:
- A large or growing polyp
- A mass in the gallbladder
- Wall thickening
- During or After Gallbladder Surgery
Sometimes, the gallbladder may be removed for gallstones, and cancer is only identified when the tissue is analysed.
- When Symptoms Appear at a Later Stage
As the condition progresses, you may notice:
- Persistent pain in the right, upper abdomen
- Jaundice
- Unexplained weight loss or fatigue
Further imaging (CT or MRI) is then used to assess the extent of disease.
How Gallbladder Cancer Is Usually Detected
Gallbladder cancer often does not cause clear symptoms early on. When symptoms do appear, they can overlap with more common conditions like gallstones or indigestion.
Persistent Upper Abdominal Pain
You may notice a dull, ongoing pain in the upper right side of your abdomen. Unlike typical gallstone pain, it is:
- Constant, rather than episodic
- Not clearly linked to a meal
- Worsening over time
The pain you feel may also extend to the back or right shoulder.
Unexplained Weight Loss
You may experience gradual weight loss without changes in diet or activity. This is often accompanied by:
- Reduced appetite
- Early fullness
- General fatigue
Jaundice and Digestive Symptoms
Jaundice occurs when bile flow is obstructed. You may notice:
- Yellowing of the skin or eyes
- Dark urine
- Pale stools
- Itching
Some people also experience nausea, bloating, or a sense of fullness.
Risk Factors of Gallbladder Cancer
While gallbladder cancer is rare, certain factors can increase the likelihood of it developing over time. These are usually linked to chronic irritation or cumulative changes in the gallbladder lining.
Gallbladder Polyps and Polyp Size Risks
In general, doctors look at the size of the polyp to determine its risk of becoming cancerous:
- Less than 6mm: Very low risk
- 6–9mm: Monitored with follow-up imaging
- 10 mm or larger: Higher likelihood of being pre-cancerous
Additional factors that increase concern include:
- An increase in size on follow-up scans
- A sessile shape, meaning the polyp is flat and broad-based rather than on a stalk
- Associated thickening of the gallbladder wall
Because the type cannot be confirmed on imaging alone, decisions are based on size, change, and context.
Chronic Gallbladder Inflammation
Long-term inflammation is one of the main drivers of gallbladder cancer development. This may be caused by:
- Gallstones
- Recurrent cholecystitis
- Conditions affecting bile flow
Over time, this ongoing irritation can lead to cellular changes.
Age and Medical History Factors
Risk also increases with:
- Age over 50
- A history of gallstones or gallbladder disease
- Conditions affecting the bile ducts (such as PSC)
- Family history of related conditions
How Gallbladder Cancer Is Diagnosed
In many cases, the process begins with a routine scan for unrelated symptoms, rather than a targeted gallbladder cancer screening.
Ultrasound Gallbladder Imaging
Ultrasound is usually the first step when assessing the gallbladder.
It can help identify:
- Gallstones
- Polyps (including their size and shape)
- Wall thickening or irregularities
However, it cannot always distinguish between benign and higher-risk findings, so results are typically interpreted alongside clinical context and follow-up.
CT Scan and Other Diagnostic Tests
If findings are unclear or concerning, further imaging may be used:
- CT scans to assess spread
- MRI or MRCP to evaluate bile ducts
- Endoscopic ultrasound (EUS) in selected cases
These are used selectively to determine whether the disease is localised or has extended.
Monitoring Suspicious Polyps
Many polyps are managed with structured surveillance rather than immediate surgery.
This involves:
- Repeat ultrasound at defined intervals
- Tracking size and growth
Monitoring is typically recommended when:
- Polyps are 6–9mm
- There are no high-risk features
Removal surgery may be considered if:
- The polyp reaches 10mm
- There is interval growth
- Additional risk factors are present
Gallbladder Cancer Treatment Options in Singapore
Your treatment will depend on how early the condition is detected and whether it has spread beyond the gallbladder. Management often centres on surgery first, with additional treatment considered when needed.
Gallbladder Removal Surgery
Surgery involves removing the gallbladder (cholecystectomy).
Depending on findings:
- Standard keyhole removal is used for early-stage disease
- More extensive surgery may be needed if spread is suspected
In some cases, cancer is only identified after gallbladder removal for gallstones, where further treatment may be recommended.
Chemotherapy or Additional Therapy
Additional treatment may be considered if:
- Cancer has spread beyond the gallbladder
- Lymph nodes are involved
- There is a higher risk of recurrence
Book a Gallbladder Cancer Screening in Singapore
If you’ve been diagnosed with a gallbladder polyp, or are experiencing persistent upper abdominal symptoms, it may be worth having it assessed rather than waiting for changes to appear.
Early evaluation allows you to understand what is low risk, what needs monitoring, and when surgical intervention may be considered.
Contact a gallbladder specialist today to review your scan results or symptoms and plan your next steps.
