system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 32-year-old man comes to the office complaining of right-sided upper abdominal pain for about 2 weeks. He is also complaining of subjective fever and malaise for the same duration. He has never been out of the United States. Additionally, he describes several episodes of bloody diarrhea and crampy abdominal pain that resolved on their own a few months ago. Travel history is noncontributory. He has been sexually active with 3 male partners in the last year and uses a condom inconsistently. He was diagnosed with syphilis 4 months ago and was treated with a single shot of penicillin. He has smoked 1 pack of cigarettes per day for the last 10 years and drinks 1–2 beers a day. Temperature is 38.7°C (101.6°F), blood pressure is 137/78 mm Hg, pulse is 98/min, respirations are 14/min, and BMI is 22 kg/m2. On physical examination, his liver is tender and palpable 2 cm below the right costal margin.
Laboratory test
 Hemoglobin  15 g/dL
 Leucocyte and differential  
Leucocyte count  12,500/mm3
Neutrophil  60%
Lymphocyte  31%
Eosinophil  1%
 Liver function test 
 ALT   100 U/L
 AST  95 U/L
ALP 220 U/L
CT scan of the abdomen shows a single cystic lesion on the right lobe of the liver. What is the diagnosis?
assistant
Amoebic liver abscess