Case list for Abscess (amebic)
There are 3 CT cases with this diagnosis.
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.
Unenhanced CT demonstrates a hypodense avascular mass in segment 7 representing amebic abscess, with thin enhancing capsule surrounded by thicker hypodense rim, representing edema, best seen on portal venous out phase ("double rim sign").
Absent surrounding hypervascularity of surrounding hepatic parenchyma, which was well seen on contrast enhanced ultrasound of the same day (see US) may be due to suboptimal early arterial contrast timing.
The CT exam was performed 5 days after initiation of treatment with metronidazole.
Large round abscess in the hepatic dome with "double-rim sign": hypervascular capsule (hyperdense inner rim) surrounded by compressed hepatic parenchyma and edema (hypodense outer rim).
Location on the right hepatic lobe, large size, round shape and absent loculationes are typical for amebic abscesses. However similar features can be found in pyogenic abscesses.