Benign liver tumor

Disease Description (Causes and Symptoms)

• Definition summary: Benign neoplasms of the liver is a general term for various types of tumors and masses that develop in the liver and do not have malignant (cancerous) characteristics. Representative types include hepatic hemangioma, simple hepatic cyst, hepatic adenoma, focal nodular hyperplasia (FNH), and nodular regenerative hyperplasia (NRH).
• Summary of causes and pathophysiology:
  • Most develop without a specific cause and are more common in women (particularly those in their 30s–60s).
  • Hepatic adenoma is associated with long-term use of oral contraceptives (high-dose hormones).
  • Hemangiomas are thought to be caused by abnormal proliferation of blood vessels, while cysts are thought to result from congenital cyst formation.
  • FNH is explained by localized hyperplasia (remodeling due to abnormal blood flow), while NRH is explained by the formation of multiple nodules caused by proliferation of periportal cells and peripheral atrophy.
• Main symptoms:
  • Most small lesions (≲5 cm) are asymptomatic.
  • Large masses may cause abdominal fullness, abdominal discomfort or pressure, dull pain, early satiety, nausea, and vomiting.
  • Rarely, if intratumoral bleeding, necrosis, or infection occurs, acute abdominal pain, fever, and bleeding symptoms (with possible shock) may develop.

Treatment Methods and Precautions

• General principles:
  • For most benign lesions, if there are no symptoms and there is no suspicion of malignancy, observation (follow-up and imaging surveillance) is sufficient.
  • Indications for treatment: symptoms (pain or pressure), rapid increase in size, risk of bleeding or rupture, or findings suspicious for malignancy (not clearly characterized on imaging), among others.
• Imaging, medication, procedures, and surgery:
  • Conservative management: Regular imaging follow-up (ultrasound/CT/MRI) and monitoring of symptoms and changes in size.
  • Medication-related measures: If hepatic adenoma is suspected, discontinuation of oral contraceptives (including estrogen) is recommended. A reduction in size may be observed after discontinuing hormone therapy.
  • Percutaneous procedures: Embolization may be considered for hemorrhagic lesions or when the risk of surgery is high.
  • Surgical treatment: Hepatic resection (partial resection) is performed for large symptomatic lesions, a risk of rupture, or cases in which malignancy cannot be ruled out. Surgery is considered for hepatic adenomas measuring ≳5–8 cm in diameter, lesions adjacent to the surface, multiple lesions, or when pregnancy is planned.
  • For cyst complications (infection, bleeding, or symptom development), needle aspiration plus sclerotherapy or surgical excision may be selected.
• Diagnostic precautions:
  • Because invasive biopsy of a hemangioma carries a risk of bleeding, imaging findings are prioritized for diagnosis.
  • Some lesions (contrast-enhanced MRI) are important for accurate differentiation, so the choice of imaging test affects treatment decisions.
• Complications and prognosis:
  • The prognosis is generally favorable. Bleeding, rupture, or infection may rarely occur, and some hepatic adenomas may have an increased risk of malignant transformation or bleeding, although this is rare; therefore, caution is needed depending on the size and whether pregnancy is planned.

Checklist Before an Outpatient Visit (Items to Bring and Example Questions)

• Recommended items to bring:
  • List of currently used medications (especially including oral contraceptives, hormone medications, and anticoagulants)
  • Notes on previously diagnosed conditions and surgical history
  • Images or reports from previous imaging tests (ultrasound, CT, and MRI) (original films/USB drive if possible)
  • Record of symptom changes (when they began, frequency and nature, triggers, and factors that worsen or improve them)
  • Whether pregnancy is planned or currently ongoing, and whether you are breastfeeding
• Things to tell the doctor in advance during the outpatient visit:
  • Recent worsening of abdominal pain, fever, fainting, noticeable weight changes, and other symptoms

Examples of General Questions to Ask the Doctor

• "How likely is it that my lesion is malignant? Do I need additional tests (CT/MRI/liver function tests)?"
• "What imaging follow-up interval is recommended? When should I have the test again?"
• "Do I need to stop the medication I am taking (especially contraceptives or hormone medications)?"
• "If surgery or a procedure is needed, what are the expected risks and recovery period?"

Examples of Disease-Specific Questions

• (If hepatic adenoma is suspected) "How many cm is my mass, and because I am planning a pregnancy, what effects (risk of bleeding or growth) could this have?"
• (If hepatic hemangioma or a large cyst is suspected) "Is there a risk of bleeding or rupture? What symptoms should I watch for in an emergency?"