Findings
There is a gas containing mass in the RLQ compatible with abscess.
Discussion
This patient is four months s/p appendectomy in Cape Verde. The likely differential in this patient is an abscess secondary to a blowout of the appendiceal stump or an abscess due to retained surgical material. At surgery, this RLQ abscess was found to contain a retained surgical sponge. The sponge did not contain the usual radiopaque marker – possibly because it was from Cape Verde.


http://eradiology.bidmc.harvard.edu/Classics/item.aspx?section=Emergency+Radiology&labelpk=33f0adab-853f-4010-a0e2-0756b3f1eac5&pk=86d9d644-87ce-4836-a080-bb12f09c6375