MRI images showing a fluid-containing tract extending from the presacral region at approximately the S2–S3 level. The tract extends anteriorly and encircles the mid portion of the pouch, well above the level of the anastomosis. No definite connection into the pouch is seen. The collection terminating in the presacral space measured 2.0 × 1.1 × 1.6 cm, with peripheral enhancement from active inflammation.