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Zorluk: OrtaGastroenterology and Hepatology

A 35-year-old man comes to the clinic due to a 3-week history of right upper quadrant abdominal pain, low-grade fevers, and a 4-kg (8.8-lb) weight loss. He returned from a 6-week backpacking trip across Southeast Asia one month ago. During his trip, he had a self-limited episode of bloody diarrhea that resolved after a few days without medical intervention. His temperature is 38.3°C (100.9°F), blood pressure is 120/80 mmHg, and pulse is 95/min. Physical examination reveals tenderness to palpation in the right upper quadrant and moderate hepatomegaly. Laboratory studies show a leukocyte count of 14,500/mm³ and an alkaline phosphatase level of 340 U/L. An abdominal ultrasound demonstrates a solitary, 6-cm, well-demarcated, hypoechoic mass in the right lobe of the liver. Enzyme-linked immunosorbent assay (ELISA) is positive for Entamoeba histolytica antibodies. Which of the following is the most appropriate next step in management?

  1. A
    CT-guided percutaneous drainage of the hepatic lesion
  2. B
    Empiric therapy with intravenous piperacillin-tazobactam
  3. C
    Fine-needle aspiration of the mass for culture and sensitivity
  4. Administration of oral metronidazole followed by paromomycinCevap
  5. E
    Oral albendazole therapy

Cevap

The correct answer is the administration of oral metronidazole followed by paromomycin.
This patient's clinical presentation (fever, right upper quadrant pain, recent travel to an endemic region, and prior bloody diarrhea) combined with a solitary right lobe liver mass and positive serology is classic for an amebic liver abscess caused by Entamoeba histolytica. The cornerstone of management for an uncomplicated amebic liver abscess is medical therapy. The regimen consists of a tissue amebicide, such as metronidazole or tinidazole, to eradicate the invasive trophozoites in the liver. This MUST be followed by a luminal amebicide, such as paromomycin, iodoquinol, or diloxanide furoate. The luminal agent is critical because metronidazole does not effectively reach therapeutic concentrations in the colonic lumen; without it, intestinal colonization persists, leading to a high risk of relapse.

Adım Adım Çözüm

1
Evaluate the patient's clinical presentation and travel history.
The patient has fever, right upper quadrant pain, hepatomegaly, and a recent history of bloody diarrhea following travel to an endemic area (Southeast Asia).
These findings raise high clinical suspicion for a parasitic liver infection, specifically an amebic liver abscess.
2
Analyze the diagnostic test results.
Ultrasound shows a solitary right lobe liver mass, and ELISA is positive for Entamoeba histolytica antibodies.
A positive serology in the presence of a characteristic liver lesion confirms the diagnosis of an amebic liver abscess without the need for invasive tissue sampling.
3
Determine the optimal treatment strategy based on the diagnosis.
The standard of care is medical management with a tissue amebicide followed by a luminal amebicide.
Metronidazole eradicates tissue trophozoites in the liver, while paromomycin eliminates intestinal cysts to prevent disease relapse. Drainage is generally not required for uncomplicated right-lobe lesions under 10 cm.

Anahtar Kavram

Uncomplicated amebic liver abscesses are treated medically with a tissue amebicide (e.g., metronidazole) followed by a luminal agent (e.g., paromomycin) to eradicate the intestinal colonization and prevent relapse.
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Gastroenterology and Hepatology

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