There is a complex thick-walled retrovesical fluid collection with a large central air-fluid level. Within the fluid collection, there is a 1.3 cm calcification/appendicolith. There are adjacent inflammatory changes and trace fluid predominantly to the right of the rectum. There is bowel wall thickening and/or incomplete distention of the rectosigmoid colon with the sigmoid colon being deviated to the left, secondary to a large complex inflammatory retrovesical fluid collection.