A...the ascending has mild inflammation of the mucosal layer with some crypt abscesses...changes in the lining related to UC.
looks like this http://library.med.utah.edu/WebPath/GIHTML/GI183.html
B...Obvious inflammation with mild ulceration. The cellular distortion is more pronounced than the ascending. No precancer or anything else noted.
C....The polyp is only related to UC, not precancer...
D....Severe inflammation, lots of cellular distortion caused by the inflammation. The mucosal folds are almost non-existant.
The inflammation is extreme to the point where changes are not necessarily not on the way to a precancer. Cytologic atypia means not typical, and from my perspective you should do the research and be checked again in maybe 6 months to see if that's changed.
The pathologist didn't state whether this was is in the rectum or the sigmoid or all throughout...which I think you need to clarify.
It's possible that once the inflammation decreases, that will eventually read to normal.
He didn't state no dysplasia...but I don't have time now to read all the possibilities of what it could mean.
If it were on my report..I'd make a list of questions for my doc and do intensive research....
More later..I have to get ready for my appointments. I'll be back around midnight or possibly late this afternoon if I get a chance.
Hope this helps.