Figure 8.

Local recurrence 2 years following resection of rectal carcinoma. (a) There is soft tissue material in the presacral space (arrow) that may be postoperative in nature but the presence of malignancy is difficult to exclude on CT alone. (b) There is a small focus of avid radiotracer uptake (arrow) on the on FDG-PET. (c) Increased uptake on FDG-PET (arrow) correlates with the presacral soft tissue (arrow) and is characteristic of tumor recurrence in a patient who has not had recent surgery in this area and has no symptoms of leak or infection.