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Occult hernia woman
It’s possible that the underlying pathology that led you to need a rectopexy also caused a hernia, that is, straining to have a Bowel movement. In other words, it was t from the MRI or proctogram.
Yes, hernia can be missed on ultrasound. Should be there on your small bowel MRI, though. And yes, your symptoms can be due to inguinal hernia.