Might it be a prolapse? Try these webpages:

http://www.anapsid.org/prolapse.html

http://www.austinsturtlepage.com/Care/medinjuries.htm (scroll down until you see Intestinal Prolapse)
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0.1.0 ornate box turtle
1.0.0 eastern box turtle
1.0.0 Yellow belly slider
0.1.0 Red belly cooter
0.1.0 Australian shepard
1.11.0 chickens
1.0.0 Dutch(rabbit)
3.2.0 children (do I still count the married ones?)
1.0.0 husband