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Health condition

Liver cysts, from harmless finding to when specialist care is needed.

Most liver cysts are simple, benign and discovered by chance. A small number need imaging follow-up, genetic testing or specialist treatment - here is how to tell the difference.

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A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Editorial team

    Written by our editorial team from the UK sources listed on each page.

  • 02

    Sourced from guidance

    Checked against British Society of Gastroenterology (BSG) and peer-reviewed hepatobiliary sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern imaging pathways, genetic testing and specialist commissioning routes for hepatic cysts.

Key facts

Liver cysts at a glance.

The essentials, in plain English - what a liver cyst is, the types, and how they’re assessed in the UK today.

  • What it is

    A fluid-filled cavity within the liver, most often a simple congenital lesion found by chance on a scan done for something else.

  • How common

    Simple hepatic cysts affect up to 5% of the population and become more frequent with age.

  • Types

    Simple cysts, polycystic liver disease, hydatid cysts, biliary cystadenoma and Caroli disease each carry a different risk profile.

  • Most are silent

    The overwhelming majority are asymptomatic and never need treatment beyond reassurance.

  • Imaging is key

    Ultrasound, CT or MRI distinguishes a simple cyst from a complex one that needs specialist review.

  • When to act

    Large symptomatic cysts, suspicious complex features or travel-related exposure warrant specialist hepatobiliary input.

Why this guide matters

Not every liver cyst is the same cyst.

A finding on a scan can mean very different things. The three points below shape everything else on this page.

  • Simple cysts are usually a non-issue

    A single cyst with clean, thin walls on imaging is a common variant found in up to 5% of people - reassurance is usually all that is needed.

  • Imaging characterisation is the crux

    Septations, thick walls or solid components change everything - they are what separate a harmless finding from one that needs specialist review.

  • Type dictates the specialist route

    Polycystic disease, hydatid infection and cystadenoma each follow their own specialist commissioned pathway, from genetics to tropical medicine to hepatobiliary surgery.

How the diagnosis is made

From a chance finding to a clear plan.

The steps a UK GP or hepatobiliary specialist will normally follow, per BSG guidance, in order - so you know what to expect and why.

  1. 01

    Assessing

    Incidental finding or symptoms

    Most cysts are found unexpectedly on an ultrasound, CT or MRI performed for another reason; some present with right-upper-quadrant discomfort.

  2. 02

    Assessing

    Imaging characterisation

    Ultrasound, CT or MRI is used to confirm the fluid-filled nature of the lesion and look for septations, wall thickening or solid components (see Private MRI Scan).

  3. 03

    Confirming

    Travel and exposure history

    A history of residence or travel in sheep-farming or endemic regions prompts hydatid serology for Echinococcus.

  4. 04

    Confirming

    Tumour markers if suspicious

    CA19-9 and CEA are checked when imaging raises concern for biliary cystadenoma or cystadenocarcinoma.

  5. 05

    Confirming

    Genetic testing for PCLD

    PRKCSH or SEC63 gene testing is considered for isolated polycystic liver disease, and ADPKD screening if kidney cysts coexist.

  6. 06

    Preparing

    Specialist hepatobiliary MDT

    Complex, symptomatic or atypical cysts are discussed at a hepatobiliary multidisciplinary team meeting under specialist commissioning.

  7. 07

    Preparing

    Surveillance planning

    Where uncertainty remains, a schedule of repeat imaging is agreed rather than immediate intervention.

Typical timeline: an incidental finding to a settled plan within a few specialist appointments.

Symptoms

What a liver cyst actually feels like.

Usually nothing at all. And the features - haemorrhage, rupture, infection, obstruction - that mean it’s time to escalate.

  • No symptoms at all

    The typical picture - a simple cyst discovered on a scan for an unrelated complaint, with no pain or other clue.

  • Right-upper-quadrant discomfort

    Larger cysts can stretch the liver capsule, causing a dull ache or fullness under the right ribs.

  • Early satiety and bloating

    A large cyst pressing on the stomach can make you feel full quickly or bloated after small meals.

  • Palpable mass

    Occasionally a large cyst can be felt as a firm swelling below the right ribs on examination.

  • Multiple cysts (polycystic disease)

    Numerous cysts throughout the liver, often alongside kidney cysts in ADPKD, or isolated in PCLD.

  • Fever and pain (infection)

    Sudden pain, fever and tenderness suggest an infected or haemorrhagic cyst - this needs urgent assessment.

  • Jaundice (biliary obstruction)

    Rarely, a cyst pressing on the bile ducts causes yellowing of the skin and eyes, dark urine or pale stools.

  • Red flag - rapid growth or complex features

    A cyst that grows quickly or shows septations, thick walls or solid areas needs prompt specialist review.

Treatment

How liver cysts are managed in the UK.

Observation first for simple cysts, with laparoscopic fenestration, antiparasitic therapy or complete excision reserved for the cysts that need them.

  • Observation and reassurance

    The right choice for the majority - simple cysts with typical imaging features rarely need anything more than watchful reassurance.

  • Laparoscopic deroofing (fenestration)

    Keyhole surgery to unroof a large symptomatic cyst so fluid can drain into the abdomen - specialist hepatobiliary surgery (see Laparoscopic Cyst Fenestration).

  • Percutaneous aspiration with sclerotherapy

    A needle-based option for selected symptomatic cysts, draining fluid and instilling a sclerosing agent to reduce recurrence.

  • Somatostatin analogues (lanreotide)

    Used selectively in symptomatic polycystic liver disease to slow cyst growth and reduce liver volume.

  • Surgical or transplant options

    Severe polycystic liver disease with major symptoms or liver failure may need partial resection or, rarely, liver transplantation.

  • Albendazole plus PAIR or surgery

    Hydatid cysts are treated with albendazole alongside puncture-aspiration-injection-reaspiration (PAIR) or surgical resection.

  • Complete surgical excision

    Biliary cystadenoma and cystadenocarcinoma need full excision because of premalignant and malignant potential - never simple drainage.

  • Surveillance imaging

    Complex or atypical cysts that do not clearly fit a benign pattern are followed with scheduled imaging rather than immediate intervention.

What this guide is based on

The sources behind every claim on this page.

UK and international hepatobiliary guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or hepatobiliary specialist knows your imaging and history and can tell you which parts apply to you. If in doubt, get seen.

  • British Society of Gastroenterology (BSG). Guidelines on the management of cystic liver disease.

  • European Association for the Study of the Liver (EASL). Clinical practice guidelines on the management of benign liver tumours, including cystic lesions.

  • World Health Organization (WHO). Guidelines for the treatment of cystic and alveolar echinococcosis in humans.

  • NHS England. Specialised commissioning standards for hepatobiliary surgery and genetics services.

Red flags

When a liver cyst needs urgent attention.

Most liver cysts are entirely manageable with reassurance alone. These are the situations that aren’t - and where urgent or specialist input is needed.

  • Sudden severe pain with fever

    Suggests haemorrhage into a cyst or infection - needs urgent same-day medical assessment.

  • Cyst rupture

    Sudden severe abdominal pain, distension or signs of shock after cyst rupture is a surgical emergency.

  • Jaundice or pale stools

    A cyst obstructing the bile ducts causing jaundice needs prompt hepatobiliary review.

  • Rapid growth or new solid component

    Any change suggesting biliary cystadenoma or cystadenocarcinoma needs urgent specialist imaging and MDT discussion.

  • Hydatid cyst with anaphylaxis risk

    Accidental spillage of hydatid fluid during any procedure can trigger severe allergic reaction - only specialist centres should intervene.

  • Caroli disease with cholangitis

    Recurrent bile duct infections in Caroli disease can be serious and need urgent antibiotics and specialist input.

  • Severe polycystic liver disease

    Massive hepatomegaly causing breathlessness, malnutrition or liver failure needs specialist transplant assessment.

  • Travel history with new symptoms

    New abdominal symptoms after travel to a sheep-farming or endemic region should prompt hydatid disease screening.

Living with it

A finding to understand, not to fear.

Four things that make the biggest difference - understanding what type you have, keeping to any surveillance plan, considering family screening where relevant, and knowing when to speak up.

A quiet reminder

A cyst on a scan report is not the same as liver disease.

For most people, a simple hepatic cyst is a finding to note and forget, not a diagnosis to worry over.

  1. 01 Reassurance

    Most cysts need nothing at all

    A simple cyst with typical imaging is a normal variant for many people - it does not mean liver disease is developing.

  2. 02 Monitor

    Follow the agreed imaging plan

    If surveillance is recommended, keep to the schedule so any change is caught early rather than missed.

  3. 03 Family

    Consider family screening in PCLD

    Polycystic liver disease can run in families - relatives may benefit from genetic counselling and screening.

  4. 04 Escalate

    Report new symptoms promptly

    New pain, fever, jaundice or rapid abdominal swelling should be reported without waiting for the next routine appointment.

Frequently asked

Everything we get asked about liver cysts.

Quick answers on simple cysts, polycystic disease, hydatid infection and when surgery is needed.

  • What is a liver cyst?

    A fluid-filled sac within the liver tissue. The great majority are simple hepatic cysts - congenital, benign and found incidentally on imaging done for another reason. Up to 5% of the population has one.

  • Do liver cysts turn into cancer?

    Simple cysts almost never become cancerous. The exception is biliary cystadenoma, a rare cystic lesion with premalignant potential that can progress to cystadenocarcinoma if not fully excised - this is why imaging characterisation matters.

  • What is polycystic liver disease?

    A condition featuring numerous liver cysts, either as part of autosomal dominant polycystic kidney disease (ADPKD) or as an isolated condition (PCLD) linked to PRKCSH or SEC63 gene changes. It is managed by specialist hepatobiliary and genetics services.

  • How is a hydatid cyst different?

    A hydatid cyst is caused by the Echinococcus tapeworm, usually acquired through contact with livestock or contaminated food in endemic regions. It needs specific antiparasitic treatment with albendazole and, often, drainage or surgery under specialist tropical medicine input.

  • When does a liver cyst need surgery?

    Surgery, usually laparoscopic deroofing, is reserved for large cysts causing symptoms such as pain, early satiety or a palpable mass, and for cystadenomas that need complete excision because of malignant potential.

  • Will I need lifelong monitoring?

    Most people with a single simple cyst need no ongoing monitoring after the initial diagnosis. Complex, atypical or polycystic disease usually does need a surveillance imaging schedule agreed with a specialist hepatobiliary team.

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