Gallbladder Polyps: When to Worry and When to Watch

Gallbladder Polyps: When to Watch and When to Act

Gallbladder polyps are growths that project from the inner wall of the gallbladder into the gallbladder lumen. They are found in approximately 5% of adults on ultrasound examinations. While the vast majority of gallbladder polyps are benign and require no treatment, a small proportion may be malignant or have malignant potential — making correct diagnosis and appropriate management essential.

Types of Gallbladder Polyps

Benign Polyps (95% of all polyps)

Cholesterol polyps (60–70%): The most common type. Small (usually <10 mm), multiple, and attached by a thin stalk. Composed of cholesterol deposits. No malignant potential. Often associated with gallstones and high cholesterol.

Adenomyomatosis (25%): Benign overgrowth of the gallbladder wall. May appear as a localised thickening or a diffuse change. No malignant potential in most cases. Can cause symptoms similar to gallstones.

Inflammatory polyps (10%): Result from chronic inflammation of the gallbladder wall. Associated with cholecystitis. No malignant potential.

Adenomas (<5%): True benign tumours of the gallbladder epithelium. Unlike cholesterol polyps, adenomas have malignant potential — they can progress to gallbladder cancer. Typically solitary, sessile (broad-based), and >10 mm.

Malignant Polyps (<5% of all polyps)

Gallbladder adenocarcinoma: The most common gallbladder cancer. May present as a polyp on ultrasound. Risk increases significantly with polyp size >10 mm.

Symptoms of Gallbladder Polyps

Most gallbladder polyps cause no symptoms and are discovered incidentally on ultrasound. When symptoms occur, they are similar to gallstone disease:

• Right upper quadrant pain or discomfort
• Nausea after fatty meals
• Bloating and indigestion

Symptoms alone cannot distinguish benign from malignant polyps.

Diagnosis

Ultrasound

The primary investigation for gallbladder polyps. Polyps appear as echogenic foci attached to the gallbladder wall that do not move with position change (unlike gallstones, which are mobile and cast a shadow).

Ultrasound features suggesting malignancy:

• Size >10 mm
• Solitary polyp
• Sessile (broad-based, not on a stalk)
• Rapid growth on follow-up
• Associated gallbladder wall thickening

CT Scan and MRI

Used for further characterisation of polyps suspicious for malignancy. Can assess for local invasion and lymph node involvement.

Endoscopic Ultrasound (EUS)

The most sensitive investigation for gallbladder polyp characterisation. Can distinguish cholesterol polyps from adenomas and early cancers with high accuracy.

Management Guidelines

Polyps <5 mm

• No immediate treatment required
• Follow-up ultrasound in 6–12 months
• If stable, annual follow-up for 2–3 years

Polyps 5–9 mm

• Follow-up ultrasound every 6 months for 2 years
• If growth is detected (increase >2 mm), consider cholecystectomy
• If stable after 2 years, annual follow-up

Polyps ≥10 mm

• Cholecystectomy is recommended due to significant risk of malignancy
• Laparoscopic cholecystectomy is appropriate for polyps 10–15 mm without features of invasion
• Open cholecystectomy may be needed for larger polyps or those with features of malignancy

Polyps of Any Size with High-Risk Features

Cholecystectomy is recommended for polyps of any size with:

• Age >50 years
• Primary sclerosing cholangitis (PSC)
• Indian subcontinent ethnicity (higher risk of gallbladder cancer)
• Concurrent gallstones
• Rapid growth on follow-up (>2 mm in 6 months)

Gallbladder Polyps vs. Gallstones

| Feature | Polyps | Gallstones |

|---------|--------|-----------|

| Ultrasound appearance | Echogenic, no shadow | Echogenic, with shadow |

| Mobility | Fixed (do not move) | Mobile (move with position) |

| Number | Usually 1–3 | Often multiple |

| Treatment | Watch or surgery | Surgery (if symptomatic) |

| Cancer risk | Small but real | Very low (except large stones) |

When to See Dr. Patil

If you have been told you have gallbladder polyps on ultrasound, a consultation with Dr. Adarsh M Patil will help you understand:

• Whether your polyps require treatment or monitoring
• The appropriate follow-up schedule
• Whether laparoscopic cholecystectomy is recommended

Book a consultation: Call +91 80889 54804 or WhatsApp +91 99724 46882.

*Medically reviewed by Dr. Adarsh M Patil, MBBS, MS (General Surgery), Fellowship in Advanced Laparoscopy & Bariatric Surgery (Belgium). Consultant General & Laparoscopic Surgeon, Apollo Clinic Indiranagar, Bangalore.*