Gallbladder Polyps: Symptoms, Cancer Risk & Treatment
- What are gallbladder polyps? (Types: cholesterol, adenoma, inflammatory)
- How common are gallbladder polyps?
- Symptoms – usually asymptomatic, sometimes biliary colic
- Cancer risk by polyp size (>10mm is high risk)
- Diagnosis – ultrasound, EUS, CT, MRI
- Treatment – surveillance vs cholecystectomy
- Follow‑up guidelines for small polyps
- Interactive FAQ – 9 common questions
What are gallbladder polyps? (Types: cholesterol, adenoma, inflammatory)
Gallbladder polyps are elevated lesions on the mucosal surface of the gallbladder wall. They are usually found incidentally on abdominal ultrasound. The majority (90‑95%) are benign, but a small proportion can be premalignant or malignant. The main types are:
- Cholesterol polyps (60‑70%): Benign, non‑neoplastic accumulations of cholesterol esters in macrophages. They are not true polyps and have no malignant potential.
- Adenomyomatosis (15‑25%): Hyperplastic change with mucosal outpouchings (Rokitansky‑Aschoff sinuses). Benign, but can mimic cancer on imaging.
- Inflammatory polyps (5‑10%): Associated with chronic cholecystitis. Benign.
- Adenomas (2‑5%): True neoplastic polyps with malignant potential (adenoma‑carcinoma sequence). Larger adenomas (>10‑15mm) have a high risk of harbouring cancer.
- Carcinoma (1‑2%): Primary gallbladder cancer presenting as a polypoid mass.
How common are gallbladder polyps?
Gallbladder polyps are found in 4‑7% of abdominal ultrasounds in adults. The prevalence increases with age and is slightly higher in men. Most polyps are small (<10mm) and benign. True adenomas are rare (0.3‑0.5% of the population).
Symptoms – usually asymptomatic, sometimes biliary colic
The vast majority of gallbladder polyps are asymptomatic and discovered incidentally. When symptoms occur, they are non‑specific:
- Right upper quadrant or epigastric discomfort.
- Biliary colic (if the polyp causes intermittent cystic duct obstruction) – rare.
- Nausea, bloating.
- Symptoms of cholecystitis or jaundice are very unusual and suggest malignancy.
Cancer risk by polyp size (>10mm is high risk)
The risk of malignancy is directly related to polyp size. Current guidelines (European Society of Gastrointestinal Endoscopy, 2022) recommend:
- Polyp size <5mm: Cancer risk <1%. Surveillance with ultrasound at 1, 3, and 5 years is optional.
- Polyp size 6‑9mm: Cancer risk 1‑5%. Surveillance at 6, 12, and 24 months. Consider cholecystectomy if growth or risk factors.
- Polyp size 10‑15mm: Cancer risk 10‑20%. Cholecystectomy is recommended.
- Polyp size >15mm: Cancer risk >30‑50%. Urgent cholecystectomy with oncological resection.
Additional risk factors for malignancy: age >50, sessile (broad‑based) polyp, solitary polyp (not multiple), associated gallstones, rapid growth on follow‑up, and presence of primary sclerosing cholangitis.
Diagnosis – ultrasound, EUS, CT, MRI
Diagnosis is usually made by imaging:
- Abdominal ultrasound (first‑line): Shows a non‑shadowing, immobile, echogenic lesion protruding from the gallbladder wall. Polyps are differentiated from stones by the absence of acoustic shadowing and lack of movement with position change.
- Contrast‑enhanced ultrasound (CEUS): Can differentiate cholesterol polyps (no enhancement) from adenomas/cancer (enhancement).
- Endoscopic ultrasound (EUS): Highly sensitive for assessing polyp morphology, size, and invasion depth. Useful for polyps >5mm to guide management.
- CT scan: Less sensitive for small polyps but can detect large polyps and lymphadenopathy in malignancy.
- MRI/MRCP: For preoperative staging if cancer is suspected.
Treatment – surveillance vs cholecystectomy
Management depends on polyp size and risk factors:
- Polyps <5mm: No routine follow‑up in low‑risk patients. If multiple risk factors, consider ultrasound at 1 year.
- Polyps 6‑9mm: Surveillance ultrasound at 6, 12, and 24 months. If stable, discharge. If growth to ≥10mm or new symptoms, cholecystectomy.
- Polyps ≥10mm: Laparoscopic cholecystectomy is recommended. If the polyp is sessile or has malignant features, open cholecystectomy with lymphadenectomy may be needed.
- Polyps with rapid growth (≥2mm over 6 months): Cholecystectomy regardless of absolute size.
- Symptomatic polyps (biliary colic): Cholecystectomy regardless of size.
Follow‑up guidelines for small polyps
For patients with polyps 6‑9mm who are not surgical candidates or decline surgery, follow‑up ultrasound at 6, 12, and 24 months is recommended. If the polyp remains stable after 2 years, surveillance can be stopped. Any growth to ≥10mm or development of symptoms should prompt cholecystectomy.
Interactive FAQ – Gallbladder polyps
Very low – about 1‑5%. Most 8mm polyps are benign cholesterol polyps. However, if the polyp is sessile, solitary, or growing, the risk increases.
No – only polyps ≥10mm, those with growth, or those causing symptoms require cholecystectomy. Small (<10mm) polyps can be observed.
No – no medication shrinks gallbladder polyps. UDCA may reduce cholesterol polyps slightly but is not reliable.
Polyps are soft tissue projections from the wall, do not move, and do not cast an acoustic shadow. Stones are mobile, cast a shadow, and are not attached to the wall.
Surveillance ultrasound at 6, 12, and 24 months. If stable after 2 years, no further follow‑up needed.
Only adenomatous polyps have malignant potential. Cholesterol and inflammatory polyps do not become cancerous.
Laparoscopic cholecystectomy is usually sufficient. If there is suspicion of invasion, open cholecystectomy with lymphadenectomy may be performed.
Large polyps (>10mm) can be seen on CT. Small polyps are better visualised by ultrasound or EUS.
Approximately 10‑20%. Cholecystectomy is recommended.
Disclaimer: This information is for educational purposes. If you have a gallbladder polyp, consult a gastroenterologist or surgeon at Vivekananda Hospital for personalised management.