History of perirectal mass with sciatica and pelvic fluid collection. PELVIS:UTERUS, ADNEXA: No significant abnormality noted.BLADDER: Foley catheter within a collapsed bladder. In the vesicouterine pouch there is a heterogeneous complex fluid collection with irregular peripheral thick-walled enhancement with restricted diffusion compatible with an abscess measuring 4.8 x 4.1 cm (series 1101/71).LYMPH NODES: No significant abnormality noted.BOWEL, MESENTERY: In the presacral space there is a bilobed cystic lesion measuring 4.5 x 3.9 cm (series 1101/60) demonstrating thin peripheral enhancement. More superiorly and to the right of midline involving the right piriformis muscle there is a 1.6 x 1.3 cm fluid collection with extensive peripheral enhancement and soft tissue edema which extends into the sacral neuroforamen. There is presacral edema.BONES, SOFT TISSUES: Large right-sided Tarlov cysts.OTHER: No significant abnormality noted.
1. Vesicouterine pouch complex 4.8 cm abscess. 2. 1.6 cm fluid collection in the right piriformis muscle with extensive surrounding inflammatory enhancement and edema. An underlying mass lesion cannot be excluded.3. Inferior presacral cystic lesion measuring 4.5 x 3.9 cm also likely represents an infected fluid collection.