Questions regarding bowel/rectal perforation.

[OnceTwice22]

Dr.,
Thank you for the work that you do.  This site provides a tremendous resource for patients with unanswered questions.

Here is my question: Would a rectal perforation, whether extraperitoneal or intraperitoneal, be confirmable via a work-up of both abdominal x-ray & abdominal/pelvic CT scan w/ oral and IV contrast?  Also, if a patient is 7 days removed from the date of initial discomfort, could a potential rectal perforation still be a viable cause for current abdominal discomfort, or would a patient be septic/suffer from peritonitis (or worse) by this point?

Thanks again.

[OnceTwice22]

And no fever, no vomiting.  Thoughts?

[OnceTwice22]

Dr.,
  Forgot to add; bowel sounds are normal, flatus & bowel movements on a daily basis.  Diarrhea initially, stool beginning to form bulk again as of yesterday.  No noticeable rectal bleeding.  Initial diagnosis for abdominal pain is colitis, unsure of bacterial or viral.  No sigmoidoscope/colonoscope performed; DRE showed no blood.