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I would not have said that these findings are normal. I usually prefer to use terms that reflect that these changes are not necessarily a sign of significant disease and are common in people with benign conditions or the conditions that you are already known to have, such as IBS or endometriosis. Of these findings, the most worrisome would be the pericolonic fat stranding, which can be a sign of inflammation of the colon, either from a primary inflammatory bowel disease or from diverticulitis. However, if there were either a primary inflammatory bowel disease or diverticulitis, it would have been detected by the colonoscopy. If the colonoscopy did not show any inflammation, then there would not be concern about the fat stranding.
The large amount of stool in the right colon and the collapsed sigmoid colon are common in people with IBS, in which the primary abnormality is altered muscular activity of the gut, and which can be either increased or decreased. Retained stool can develop in areas with decreased muscular activity and an empty or collapsed colon can develop in areas with increased muscular activity.
The small amount of free fluid in the lower right quadrant is a common finding in someone with endometriosis, as these endometrial implants can bleed or otherwise ooze fluid.
The retroverted uterus is not considered a disease process.
Since this started after taking the Bactrim, the other diagnosis to consider would be a bacterial overgrowth in the intestines. This can mimic or occur alongside IBS and can sometimes be difficult to detect. Cultures of the stool cannot identify if there is excessive growth higher in the intestines. A hydrogen breath test may help to detect the problem. The probiotics may help with bacterial overgrowth, but it also may need a course of antibiotics oriented towards the germs that tend to cause the overgrowth, such as rifaximin, levofloxacin, or metronidazole. Some doctors may consider a trial of antibiotics, even if a definitive diagnosis cannot be established.
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