Presacral Anastomotic Sinus After Low Anterior Resection Mimicking Recurrent Rectal Cancer.

Presacral anastomotic sinus is recognized as a complication of anastomotic leakage in patients with rectal cancer. Active inflammation in the anastomotic sinus can masquerade as pelvic recurrence of rectal cancer. We present a case of progressive inflammation in anastomotic sinus demonstrated by serial FDG PET/CT scans. Despite its benign nature, increased FDG uptake in this nonnegligible condition, which could lead to further detrimental complications including secondary cancer, may have clinical implications.