Hepatic hydatid cysts: diagnosis and surgical management

General Surgery · Hepatology

Hepatic hydatid disease, also known as cystic echinococcosis (CE), is a parasitic infection caused predominantly by the larval stage of Echinococcus granulosus. The liver is the most commonly affected organ. Infection occurs following the ingestion of parasite eggs, leading to gradual cyst development within hepatic tissue. Although these cysts may remain asymptomatic for years, progressive enlargement can cause abdominal pain, biliary obstruction, secondary infection, rupture and potentially life-threatening anaphylactic reactions. Accurate diagnosis and assessment of cyst characteristics are therefore essential for treatment planning. Management depends on cyst stage, size, location and associated complications, with options including pharmacological therapy, percutaneous interventions and surgery. Surgical management remains particularly important in selected patients with complicated cysts, aiming to achieve effective disease control while minimising recurrence and postoperative complications.[1]Clinical presentation and diagnostic evaluationClinical presentation: Patients may present with right upper quadrant pain, abdominal discomfort, hepatomegaly, nausea, or a palpable abdominal mass. Complicated cases may develop jaundice, fever, cholangitis, or acute abdominal symptoms following cyst ruptureImaging assessment: Abdominal ultrasonography is the primary diagnostic modality and helps determine cyst morphology, internal septations, daughter cysts, and disease stage. Computed tomography (CT) and magnetic resonance imaging (MRI) provide additional anatomical information and help assess complications and biliary involvementSerological evaluation: Echinococcal antibody testing can support the diagnosis, particularly when imaging findings are inconclusive. However, negative serological results do not exclude infectionSurgical management of hepatic hydatid cystsIndications for surgery: Surgical intervention is generally considered for complicated cysts, including infected cysts, cysts communicating with the biliary tree, ruptured cysts, and lesions associated with significant compression or other complicationsConservative surgical procedures: Cyst evacuation with partial pericystectomy involves removing the cyst contents and accessible portions of the pericyst while preserving as much functional hepatic tissue as possible. The residual cavity requires appropriate management to reduce postoperative complicationsRadical surgical procedures: Total pericystectomy involves complete removal of the cyst and surrounding fibrous pericyst. Hepatic resection may be considered when the cyst extensively involves hepatic parenchyma or when complete removal requires anatomical liver resectionOpen and laparoscopic approaches: Open surgery provides direct access for managing large, deep, or complicated cysts. Laparoscopic surgery may be considered for appropriately located cysts, depending on surgical expertise, available resources, and patient characteristicsIntraoperative precautions: Careful isolation of the operative field and controlled evacuation of cyst contents are important to minimize spillage, secondary dissemination, and anaphylactic reactions. Suspected biliary communication requires particular attention during operative planningAdjunctive treatment and postoperative surveillanceAntiparasitic therapy: Albendazole is used as an adjunct to selected surgical and percutaneous interventions. Treatment duration should follow the applicable clinical guideline and individual patient assessmentManagement of spillage: When intraoperative spillage is suspected or confirmed, the World Health Organization (WHO) suggests combining Albendazole with PraziquantelPostoperative monitoring: Patients should undergo clinical and imaging follow-up to assess residual disease, cyst recurrence, biliary complications, and postoperative infectionStage-based treatment considerationsWHO cyst stageCharacteristic findingsPreferred management for uncomplicated hepatic cystsCE1Unilocular, active cystAlbendazole for cysts smaller than 5 cm; PAIR with Albendazole for selected larger cystsCE2Multivesicular cyst with daughter cystsAlbendazole for cysts 5 cm or smaller; surgery with Albendazole for larger cystsCE3aCyst with detached membranesAlbendazole for cysts smaller than 5 cm; PAIR with Albendazole for selected larger cystsCE3bCyst with daughter cysts and partially solid matrixAlbendazole for cysts 5 cm or smaller; surgery with Albendazole for larger cystsCE4–CE5Inactive or degenerative cystsImaging surveillance unless complications developPAIR: Puncture, aspiration, injection, and re-aspiration. Treatment selection should follow the WHO 2025 recommendations and account for cyst characteristics and available expertise.[2][3]ConclusionHepatic hydatid cysts, caused by Echinococcus infection, vary in size and may remain asymptomatic for prolonged periods. However, complications such as cystobiliary communication, intraperitoneal or bronchial rupture and, rarely, fistulisation into the duodenum can significantly increase morbidity. Effective management requires accurate imaging-based staging and individualised treatment selection. Although surgery remains essential for complicated cysts and selected active lesions, treatment may also involve pharmacological therapy, percutaneous interventions or active surveillance, depending on cyst characteristics and clinical presentation. Appropriate patient selection, prevention of intraoperative spillage and long-term follow-up are crucial to minimise recurrence and treatment-related complications.[4]Reference(s):1. Botezatu C, Mastalier B, Patrascu T. Hepatic hydatid cyst - diagnose and treatment algorithm. J Med Life. 2018;11(3):203-209. doi:10.25122/jml-2018-0045. https://pmc.ncbi.nlm.nih.gov/articles/PMC6197524/2. World Health Organization. WHO Guidelines for the Treatment of Patients With Cystic Echinococcosis. World Health Organization; 2025. Accessed November 11, 2026. https://www.who.int/publications/i/item/97892401104723. Centers for Disease Control and Prevention. Clinical Treatment of Echinococcosis. Centers for Disease Control and Prevention. Updated May 11, 2024. Accessed November 11, 2026. https://www.cdc.gov/echinococcosis/hcp/clinical-care/index.html4. Shaikh O, Gaur NK, Vijayakumar C, Kumbhar U, Kalayarasan R. Hepatic Hydatid Cyst With Cystobiliary Communication and Cystoduodenal Fistula. Cureus. 2021;13(8):e17473. Published 2021 Aug 26. doi:10.7759/cureus.17473. https://pmc.ncbi.nlm.nih.gov/articles/PMC8475944/