Causes of rectal wall thickening.

If by thickening. You r referring to inflammation then the etiology is either infect/ischemic/or malignany.Cts and MRI will show the wall to be thickened in each of the above causes.It can also be from chronic straining, prolapse and certain stds.Ulcerative proctitis is a type of inflamm. Bowel disease can also present as thickening in imaging studies. They are all diagnosed by proctoscopy with biopsies or cultures.