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Table 1 Ultrasonography criteria for acute acalculous cholecystitis

From: Acalculous cholecystitis occurring in the context of Plasmodium malariae infection: a case report

Major criteria Minor criteria
• Gallbladder wall thickening ≥3mm • Gallbladder distension (>5cm)
• Wall edema • Echogenic bile (sludge)
• Intramural gas  
• Mucosal sloughing  
• Pericholecystic fluid  
• Sonographic Murphy’s sign  
  1. Two major or one major and two minor criteria are needed for diagnosis.