Gallbladder polyp

Disease Description (Causes and Symptoms)

• Definition: A gallbladder polyp (GB polyp) is a protruding lesion that develops on the inner wall of the gallbladder, and most are benign (such as cholesterol polyps, inflammatory polyps, and adenomas). A small proportion may be malignant (gallbladder cancer).
• Causes/Pathophysiology: The cause is unknown in most cases. Cholesterol deposition, chronic inflammation, and mucosal hyperplasia may be involved. Cholesterol polyps are often associated with metabolic factors such as obesity.
• Main symptoms: Most are asymptomatic. Rarely, they may cause upper abdominal pain (in the right upper abdomen or epigastrium) or acute pain due to obstruction of the cystic duct.

Treatment Methods and Precautions

• Diagnosis/Additional tests
  • Abdominal ultrasound: Used as the first-line test and detects approximately 90% of polyps.
  • Endoscopic ultrasound (EUS): More useful than regular ultrasound for evaluating the characteristics of the lesion (such as attachment pattern and invasion between layers).
  • Abdominal CT/MRI: Used as additional tests when malignancy is suspected.
• Treatment principles
  • Most small, asymptomatic benign polyps are monitored with follow-up examinations (conservative management).
  • Surgery (cholecystectomy; usually laparoscopic cholecystectomy) is recommended in the following cases:
    • Polyp size ≥ 10 mm (increased risk of cancer)
    • An increase in size (growth) or change in shape during follow-up
    • Presence of symptoms or findings suspicious for gallbladder cancer (imaging or clinical findings)
    • Surgery may be considered in high-risk groups (older age, a history of cholecystitis, concomitant gallstones, a sessile form in which the polyp is broadly attached to the base, etc.)
• Medication/Non-surgical treatment
  • There is no standard medication that eliminates benign cholesterol polyps themselves. When symptoms are present, symptomatic treatment such as pain control is provided.
  • Metabolic management (weight reduction and lipid management) may help improve related risk factors.
• Lifestyle management and precautions
  • Regular follow-up ultrasound examinations are recommended (see the outpatient pre-visit checklist below).
  • Seek medical attention immediately if acute right upper abdominal pain, fever, or jaundice develops (suspected cholecystitis or biliary obstruction).
  • Management of metabolic risk factors such as obesity and hyperlipidemia is recommended (as they are associated with cholesterol polyps).
• Complications and prognosis
  • Most are benign and have a favorable prognosis. The risk of malignant transformation is approximately 3–8%, depending on the report (and increases when risk factors such as size and age are present).
  • There is a possibility of surgical complications (the usual complications of cholecystectomy) and, rarely, progression to gallbladder cancer.

Outpatient Pre-Visit Checklist (Including Items to Bring and Example Questions)

• Items to bring
  • Results of previous imaging tests such as abdominal ultrasound, CT, or MRI (if possible, image files or the radiology report)
  • List of medications currently being taken (including anticoagulants and antiplatelet drugs)
  • Medical history: gallstones, cholecystitis, hepatobiliary surgery, and chronic diseases (diabetes, hypertension, and hyperlipidemia)
  • Symptom records: timing, nature, and duration of pain; presence or absence of fever or jaundice; weight changes; etc.
• Useful information during the consultation
  • When the polyp was first detected and its previous size (and whether it has changed, if known)
  • Frequency of abdominal pain and triggering factors (such as after meals)
• Precautions before testing
  • Follow the instructions regarding whether fasting is required when scheduling an ultrasound (this varies by institution).
  • Patients taking anticoagulants must consult their physician before any procedure or surgery.

Examples of General Questions to Ask the Doctor

• "Could my polyp be malignant? What are the risk factors?"
• "Based on the current imaging, do I need additional tests (EUS, CT, or MRI)?"
• "What are the criteria for recommending surgery?"
• "What should the interval between follow-up examinations be?"
• "Please tell me about the side effects of this medication or recovery after surgery."
• "What is the prognosis, and how likely are complications?"

Examples of Condition-Specific Questions

• "My polyp is 6–9 mm. At what intervals should I have follow-up ultrasound examinations?"
• "My polyp is smaller than 10 mm, but I am in my 50s or older. Would you recommend surgery, or can the decision about surgery be based on the findings of additional tests?"

(Note: The recommendations above are summarized based on general clinical guidelines. In actual medical care, the physician makes the final decision after considering the patient's age, comorbidities, imaging findings, and other factors.)