From what I know, it seems that for those who had cancer, their butt cheeks are sewn together because the surgeon removes more as they want to make sure they've gotten all of the tumour. For those with IBD, it seems more common just to have the hole closed up and the butt cheeks remain as they were.
Ileostomy for 34 years due to UC. I had my surgery at 10 years of age.
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I'm not a complete idiot - some parts of me are missing!