B66.2 Dicroceliasis

Name of the Condition

• Dicroceliasis

Summary

Dicroceliasis is a parasitic infection caused by the liver fluke Dicrocoelium dendriticum. The infection primarily affects the bile ducts and liver, leading to inflammation and potential long-term complications. It is commonly associated with the consumption of raw or undercooked intermediate hosts, such as ants or grasshoppers, containing fluke larvae. The condition may be asymptomatic in mild cases but can progress to more severe disease in chronic infections.

Causes

The infection is caused by ingesting the larvae of Dicrocoelium dendriticum, which are present in raw or undercooked intermediate hosts. The larvae mature into adult flukes in the human bile ducts, where they attach and reproduce, releasing eggs that are excreted in feces. Contaminated food preparation practices or ingestion of infected insects facilitate transmission.

Risk Factors

• Consumption of raw or undercooked intermediate hosts (e.g., ants, grasshoppers) from endemic regions.
• Residing in or traveling to areas where Dicrocoelium infection is common (e.g., rural or pastoral regions).
• Poor sanitation or lack of access to safe food and water.
• Occupational exposure to livestock or environments where intermediate hosts are prevalent.

Symptoms

• Abdominal pain, particularly in the upper right quadrant.
• Nausea, vomiting, or diarrhea.
• Fatigue, fever, or general malaise.
• Jaundice or liver dysfunction in severe cases.

Diagnosis

Diagnosis typically involves identifying Dicrocoelium eggs in stool samples or bile fluid. Serological tests may support the diagnosis, though they are less specific. Imaging studies, such as ultrasound or CT scans, can assess liver and bile duct involvement. A history of exposure to endemic regions or intermediate hosts may also aid in diagnosis.

Treatment Options

Treatment usually involves antiparasitic medications, such as triclabendazole or praziquantel, to eliminate the flukes. Supportive care, including pain management and hydration, may be necessary for symptomatic relief. In severe cases, additional interventions to address complications (e.g., bile duct obstruction) may be required.

Prognosis and Follow-Up

With appropriate treatment, the prognosis is generally good, and most patients recover fully. Chronic infections may lead to long-term liver or bile duct damage if left untreated. Follow-up may include monitoring for recurrence of symptoms or complications, especially in endemic areas.

Complications

• Chronic liver inflammation or fibrosis.
• Bile duct obstruction or cholangitis.
• Gallbladder disease or cholecystitis.
• Rarely, progression to liver cirrhosis or cancer in severe, untreated cases.

Lifestyle & Prevention

• Avoid consuming raw or undercooked intermediate hosts (e.g., ants, grasshoppers).
• Practice good hygiene, including handwashing after handling soil or livestock.
• Ensure food is properly cooked, especially in endemic regions.
• Use safe water sources and avoid contaminated environments.

When to Seek Professional Help

Seek medical attention if you experience persistent abdominal pain, jaundice, or unexplained fatigue, especially after potential exposure to endemic areas or intermediate hosts. Early diagnosis and treatment can prevent complications.

Tips for Medical Coders

When coding for dicroceliasis, use ICD-10-CM code B66.2. Ensure documentation supports the diagnosis, including clinical findings, exposure history, and diagnostic test results. Note that this code is specific to Dicrocoelium infections and should not be used for other fluke-related conditions.