Case 1: Abscess (amebic)
35 year old man with fever, right upper quadrant abdominal pain and vomiting.
CT: Thin wall and perifocal edema
CT demonstrates large central amebic liver abscess. The present image represents the subacute stage of the abscess with a thin capsule, perilesional hypodense edema, internal enhancing membranes and confluent loculations (compare to "acute abscess" with cluster sign and no distinct capsule). The patient was successfully treated with percutaneous drainage and metronidazole.
Courtesy Tarun Pandey, MD, Hemendra Shah, MD, University of Arkansas for Medical Sciences, AK, USA.