Hungarian to English Medical Medical: Health Care Zárójelentés

Dear forum,

If sigm. is short for 'sigmoid', how is the following to be interpreted:

Gattaji laesiok miatt anus sigm. keszult tehermentesitesnek

I presuppose some intervention was done to alleviate pain, but what is the subject of 'keszult' here?

Thanks for your help!
Jilt