Right Upper Quadrant Pain

Liver:

 - Infectious: Acute viral hepatitis, Liver abscess

 - Non-infectious: hepatitis (Alcohol, Medications), Hepatic congestion (e.g. heart failure), Budd-Chiari syndrome

Biliary:

 - Infectious: Acute cholecystitis, Acute cholangitis (a.k.a. "ascending cholangitis")

 - Non-infectious: Gallstones (a.k.a. "biliary colic"), Choledocholithiasis

Other: RLL Pneumonia, Subdiaphragmatic abscess



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