Liver Cysts
Fluid-filled sacs in or on the liver
Quick Facts
- Type: Liver (hepatic) condition
- Most common type: Simple, benign cyst
- Usual symptoms: Often none
- Seek care: Pain, fever, jaundice, or a growing mass
Overview
Liver cysts are pockets of fluid that form within or on the surface of the liver. The most common kind, a simple cyst, has a thin wall and contains clear fluid. These are very common, usually harmless, and most are discovered by accident during an ultrasound or CT scan done for another reason.
Most people with liver cysts never know they have them and need no treatment. A small number of cysts grow large, bleed, become infected, or are part of an inherited condition in which many cysts form. Understanding which cysts matter helps avoid unnecessary worry while making sure the few that need attention are managed. Because imaging is now used so often, liver cysts are found more frequently than in the past, and being told you have one can be alarming even though the great majority are completely benign and require nothing more than reassurance.
Symptoms
Most liver cysts cause no symptoms at all. When a cyst grows large, it can press on nearby organs and cause discomfort.
- A dull ache or fullness in the upper right abdomen
- Bloating or feeling full quickly after eating
- A noticeable mass or swelling in some cases
- Nausea
Less common but more concerning symptoms include sudden severe abdominal pain (which may mean a cyst has bled or burst), fever and chills (which may mean infection), or yellowing of the skin and eyes (jaundice) if a cyst presses on the bile ducts. These warrant prompt medical attention.
Causes
Liver cysts can form for several reasons:
- Simple cysts: Most are thought to be present from birth, arising from small malformed bile ducts. They are not cancerous.
- Polycystic liver disease: An inherited condition in which many cysts form in the liver, sometimes alongside cysts in the kidneys.
- Infection: A parasite (echinococcus, more common in some parts of the world) or a bacterial abscess can create a cyst-like collection.
- Other growths: A small number of cysts are part of a tumor and may need closer evaluation, though most are benign.
Risk Factors
- Older age (simple cysts are found more often as people age)
- Female sex, especially for polycystic liver disease
- A family history of polycystic liver or kidney disease
- Travel to or living in areas where parasitic liver infection is common
Diagnosis
Liver cysts are usually found on imaging, often by chance. Tests help confirm a cyst is simple and benign versus one that needs follow-up.
- Ultrasound: The first and often the only test needed; it shows fluid-filled cysts clearly.
- CT or MRI scan: Used when a cyst looks complex, is large, or needs a closer look at its walls.
- Blood tests: Liver function tests and, when infection is suspected, tests for parasites or signs of infection.
Treatment
Most liver cysts need no treatment, only reassurance and occasional monitoring. Treatment is reserved for cysts that cause symptoms or complications.
- Watchful waiting: Small, simple cysts are simply observed, sometimes with a repeat scan.
- Draining the cyst: A large symptomatic cyst can be drained with a needle, often combined with an injection that helps stop it from refilling.
- Surgery: A persistent or recurring cyst can be treated with a procedure that removes part of the cyst wall, often done with minimally invasive (keyhole) surgery.
- Treating infection or parasites: Antibiotics or anti-parasitic medicines, and sometimes drainage, are used when a cyst is infected.
For polycystic liver disease, treatment focuses on relieving symptoms from a large, cyst-filled liver and may involve medication, draining the largest cysts, or, in severe cases, surgery. Most people with simple cysts, however, can be reassured that their cyst will not turn into anything harmful and can carry on normally without restrictions.
Prevention
Most liver cysts cannot be prevented because they are present from birth. A few steps lower the risk of the infectious types:
- Practice good hand and food hygiene, especially when traveling in areas where parasitic liver infection is common
- Avoid contact with dog feces in regions where echinococcus is present
- Attend recommended follow-up scans if you have a known cyst or polycystic liver disease
When to See a Doctor
See a doctor if you have ongoing pain or fullness in the upper right abdomen, or if a known cyst is getting larger. Seek prompt care if you develop:
- Sudden, severe abdominal pain
- Fever and chills, which may mean a cyst is infected
- Yellowing of the skin or eyes (jaundice)
- A rapidly growing or tender mass
These can signal bleeding, infection, or blockage of the bile ducts and should be evaluated without delay.
Frequently Asked Questions
Are liver cysts dangerous?
Most liver cysts are simple, benign, and harmless, causing no symptoms and needing no treatment. A small number grow large, bleed, become infected, or are part of an inherited condition, which is why occasional monitoring is sometimes advised.
Do liver cysts need to be removed?
Usually not. Simple cysts that cause no symptoms are just observed. Removal or drainage is considered only when a cyst causes pain, grows very large, becomes infected, or keeps coming back after drainage.
Can liver cysts turn into cancer?
Simple liver cysts are not cancerous and very rarely become cancer. Some complex or unusual-looking cysts need closer evaluation with a CT or MRI scan, but the great majority of liver cysts are benign.
What is polycystic liver disease?
Polycystic liver disease is an inherited condition in which many cysts form throughout the liver, sometimes along with kidney cysts. It can cause an enlarged liver and abdominal discomfort and may need specialist care, though many people remain well.
How are liver cysts found?
Most are discovered by chance during an ultrasound or CT scan done for another reason. Ultrasound is usually enough to confirm a simple cyst, with CT or MRI used for larger or more complex cysts.
References
- MedlinePlus, U.S. National Library of Medicine. Liver cysts.
- Mayo Clinic. Liver cysts and polycystic liver disease.
- American Liver Foundation. Benign liver tumors and cysts.
- National Library of Medicine, StatPearls. Hepatic Cysts.