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Things worth knowing about "Cystic Echinococcosis"

Cystic echinococcosis is a parasitic disease caused by the tapeworm Echinococcus granulosus, leading to the formation of fluid-filled cysts, primarily in the liver and lungs.

What is Cystic Echinococcosis?

Cystic echinococcosis (CE), also known as cystic hydatid disease, is a parasitic infection caused by the larval stage of the tapeworm Echinococcus granulosus. Humans act as accidental intermediate hosts in this parasitic life cycle. The larvae form fluid-filled cysts called hydatid cysts that most commonly develop in the liver and lungs. Cystic echinococcosis is classified as a neglected tropical disease and is found worldwide, with the highest rates in regions where livestock farming is common.

Causes and Transmission

The causative agent is the tapeworm Echinococcus granulosus, which uses dogs and other canids (e.g., wolves, foxes) as its definitive hosts. The natural intermediate hosts are sheep, cattle, and other ungulates. Humans become infected by accidentally ingesting tapeworm eggs shed in the feces of infected dogs. Common routes of infection include:

Direct contact with infected dogs (petting, being licked)
Consuming contaminated, unwashed fruits, vegetables, or berries
Contact with contaminated soil or water

After ingestion, larvae hatch in the intestine, penetrate the intestinal wall, enter the bloodstream, and settle predominantly in the liver (approximately 70% of cases) or the lungs (approximately 20% of cases). Other organs such as the spleen, kidneys, bones, or brain may be affected less frequently.

Symptoms

The disease often remains asymptomatic for many years, as cysts grow slowly. When symptoms do appear, they depend on the affected organ and the size of the cyst:

Liver Involvement

Dull pressure or a feeling of heaviness in the upper right abdomen
Nausea and vomiting
Jaundice (icterus) if bile ducts are compressed
Palpable abdominal swelling with large cysts

Lung Involvement

Chronic cough
Chest pain
Coughing up blood (hemoptysis)
Shortness of breath (dyspnea)

Complications

A particularly dangerous complication is the rupture of a cyst, which can trigger a severe anaphylactic shock and cause the seeding of daughter cysts throughout the body.

Diagnosis

Diagnosis of cystic echinococcosis is based on a combination of imaging and serological testing:

Ultrasound (sonography): The first-line method for liver involvement; shows characteristic cyst structures including daughter cysts
Computed tomography (CT) and MRI: Used for precise localization, size assessment, and treatment planning
Serology (blood test): Detection of antibodies against Echinococcus antigens (e.g., ELISA, Western blot); may yield false-negative results in pulmonary cysts
WHO Classification: Cysts are classified according to the WHO-IWGE scheme into active (CE1, CE2), transitional (CE3), and inactive/degenerative stages (CE4, CE5), which guides therapy decisions

Treatment

Treatment depends on the stage, size, and location of the cyst, as well as the general health of the patient. Several options are available:

Medical (Drug) Therapy

The benzimidazole drug albendazole is the treatment of choice. It inhibits cyst growth and is frequently used in combination with other treatment modalities. Drug-only therapy is particularly indicated for small cysts or patients who are not suitable for interventional procedures.

PAIR Procedure

PAIR (Puncture, Aspiration, Injection, Re-Aspiration) is a minimally invasive procedure in which the cyst is punctured under ultrasound guidance, the fluid is aspirated, a scolicidal agent is injected, and then re-aspirated. It is always performed in combination with albendazole treatment.

Surgical Therapy

Surgery may be necessary for complicated or large cysts, ruptured cysts, or certain organ involvements. Options include removal of the cyst (cystectomy) or resection of the affected organ segment.

Watchful Waiting

Inactive cysts in stages CE4 and CE5 may not require active treatment and can be managed with regular imaging follow-up.

Prognosis and Prevention

With early and adequate treatment, the prognosis is generally favorable. However, relapses (recurrences) are possible. Prevention is especially important in endemic regions and includes:

Regular deworming of dogs
Hygiene measures such as thorough handwashing after animal contact
Thorough washing of fruits, vegetables, and berries
Avoiding feeding raw slaughterhouse waste to dogs

References

World Health Organization (WHO): Echinococcosis Fact Sheet, 2023. Available at: https://www.who.int/news-room/fact-sheets/detail/echinococcosis
Brunetti E. et al. - Expert consensus for the diagnosis and treatment of cystic and alveolar echinococcosis in humans. Acta Tropica, 2010; 114(1): 1-16.
Centers for Disease Control and Prevention (CDC): Echinococcosis. Available at: https://www.cdc.gov/parasites/echinococcosis/index.html

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