Abdominal Abscess

"Collection of pus".

It can be in any organ or abdominal cavity based on the etiology

Post-op
Diverticulitis
Appendicitis
Pancreatitis

What are the imaging findings of intra abdominal abscess?

Abnormal fluid collection, usually with air seen outside the lumen of the bowel.
Periphery may enhance with intravenous contrast material.

CT scan in a patient with Subdiaphragmatic abscess
post splenectomy

The arrow points to multiloculated thick walled fluid collection in the left upper quadrant of the abdomen.
Note the absence of spleen.

IVP in a patient with Renal abscess

40 year old man with fever and diarrhea for two weeks duration. He has infected urine.
IVP shows functioning right kidney (black arrowhead).
No function noted in the left kidney.
Air pockets seen in the left flank (white arrowheads).

Renal abscess

CT shows a large mass in the left renal area with multiple air pockets and absence of functioning renal parenchyma.