Hi,
Welcome back to icliniq.com.
I have read your question in detail and know you are very concerned for your child.
Proctocolitis is a term used for inflammation of the rectum and colon. In proctitis, there is inflammation of the anus with inflammation of the last six inches of the rectum; in proctitis, there is no inflammation of the colon.
Proctocolitis does not have an association with anal abuse. It is primarily infective in nature, like infection by Chlamydia trachomatis, LGV (Lymphogranuloma Venereum), Neisseria gonorrhoeae, HSV, and Campylobacter species. In contrast, proctitis is associated with sexual abuse and sexually transmitted infection such as lymphogranuloma venereum and herpes proctitis.
The CAT scan report you mentioned stated a very inflamed rectum and lower colon, about 12 inches from the anus. Still, it is tough to comment on a single picture of a CAT scan showing how much the colon is inflamed and whether the rectum is inflamed. If there had been any physical examination at the initial emergency room (ER) examination, we would have certainly known whether any injury marks or tears were present at the anal region. Since there is no history of on-and-off diarrhea in your child, and stool is like a soft paste, we can easily rule out celiac disease as a cause.
The vomiting that was thick and like a paste could be due to temporary obstruction at the intestinal level, which I am sure will relieve as symptoms decrease and inflammation subsides.
If I were in the ER Room and upon looking at this CT Scan report, I would have definitely examined the anal region and immediately asked for a surgery specialist's opinion right away, as this would have made the diagnosis 100 % clear.
To conclude:
If the CAT scan images and doctor's opinion is of proctocolitis, and if there are no injury marks at the anal region, we can lower the possibility of sexual abuse. Since your child has no on-and-off loose stool problem, we can rule out the possibility of celiac disease.
I would like to know the results of sexually transmitted infections in your child, as it will help make a precise diagnosis. I sincerely advise you to make the child calm and give him confidence and try not to discuss anything in front of him. If anal sex has not happened, then also you have evidence of sexual abuse of the child, which can be detrimental to the child's mind, so irrespective of whether there is anal sex or not, the culprit should be punished so that this kind of pathetic things do not happen in future. I would like to know how is your child's health now, how is his mental condition and what are the results of the reports at the hospital.
Wishing for your child's early recovery.
Take care.