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Liver Cyst: Causes, Symptoms & Treatment

A liver cyst is a fluid-filled cavity within the liver. Most liver cysts are benign and do not cause any symptoms.

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Things worth knowing about "Liver Cyst"

A liver cyst is a fluid-filled cavity within the liver. Most liver cysts are benign and do not cause any symptoms.

What Is a Liver Cyst?

A liver cyst (also called a hepatic cyst) is a fluid-filled, enclosed cavity within the liver tissue. The vast majority of liver cysts are benign (non-cancerous) and do not pose a serious health risk. They are often discovered incidentally during an abdominal ultrasound performed for other reasons, as they typically cause no symptoms. Liver cysts affect approximately 2 to 7 percent of the general population and are more common in women than in men.

Causes

Liver cysts can be either congenital (present from birth) or acquired. The main types include:

Simple (solitary) liver cysts: The most common type. They are thought to result from a developmental abnormality of the bile ducts during embryonic growth.
Polycystic liver disease (PLD): A genetic condition in which multiple cysts develop throughout the liver. It is often associated with polycystic kidney disease.
Echinococcal (hydatid) cysts: Caused by parasitic tapeworms (Echinococcus granulosus or multilocularis). These require specific medical treatment.
Liver abscess: A pus-filled cavity caused by bacterial or parasitic infections.
Post-traumatic cysts: Biliomas or hematomas that can develop following liver injury or surgery.

Symptoms

Most simple liver cysts cause no symptoms and are discovered by chance. However, larger cysts or clusters of cysts may lead to:

A feeling of pressure or dull pain in the upper right abdomen
Bloating or a sensation of fullness
Nausea
A palpable lump or swelling in the abdominal area
In rare cases: jaundice (yellowing of the skin and eyes) if a cyst compresses a bile duct

If a cyst ruptures or becomes infected, sudden and severe abdominal pain may occur, which requires immediate medical attention.

Diagnosis

Liver cysts are typically diagnosed using imaging techniques:

Ultrasound (sonography): The most common and straightforward method. Simple cysts appear as smooth, round, echo-free structures on ultrasound.
Computed tomography (CT scan): Provides detailed information about the size, location, and nature of the cyst.
Magnetic resonance imaging (MRI): Particularly useful for characterizing complex or unusual cysts.
Blood tests: May be used to rule out parasitic infection (e.g., echinococcosis) or to assess liver function.

Treatment

Most simple, asymptomatic liver cysts do not require treatment and are only monitored with regular check-ups. When treatment is needed due to symptoms or complications, the following options are available:

Watchful waiting: Regular ultrasound follow-ups for small, asymptomatic cysts.
Aspiration and sclerotherapy: The cyst is drained using a fine needle under ultrasound guidance, and a sclerosing agent (e.g., ethanol) is injected to prevent the cyst from refilling.
Laparoscopic fenestration (deroofing): A minimally invasive surgical procedure in which part of the cyst wall is removed to allow the cyst to drain and prevent recurrence.
Surgical resection: Removal of very large or complicated cysts may require open or laparoscopic surgery.
Medical therapy: For parasitic cysts (echinococcosis), antiparasitic medications such as albendazole are used, often in combination with surgery.

Prognosis

The prognosis for simple liver cysts is excellent. They are generally harmless, grow slowly if at all, and rarely cause complications such as rupture, bleeding, or infection. In advanced polycystic liver disease, liver function may become impaired. Parasitic cysts require consistent treatment but are well manageable when diagnosed and treated in a timely manner.

References

Patel T. - Liver cysts: a practical approach to understanding and management. Hepatology, 2022.
European Association for the Study of the Liver (EASL) - EASL Clinical Practice Guidelines on the management of cystic liver diseases. Journal of Hepatology, 2022.
Feldman M., Friedman L.S., Brandt L.J. - Sleisenger and Fordtran's Gastrointestinal and Liver Disease. Elsevier, 11th edition, 2021.

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