Amebic abscess

1. Pathogenesis:

• Common in 3^rd world.
   
• Transmitted by fecal-oral route.
   
• The organism, Entamoeba histolytica, first infects the colon, then gains access to the liver via portal venous system.

2. Radiographic findings:

• U/S & CT: indistinguishable from bacterial abscess. Tends to be peripheral in location.
   
• U/S guided Aspiration: the classic "anchovy paste" appearing material when aspirated.