"extraordinary rare" is still too much, and trivialises the issue. There is serious lobbying in place in many countries to make it happen more. As you know, the only acceptable rate is 0. One important stepping stone in getting this rate back down to 0 is to make it illegal tout court even for adult. There should not even be medical infrastructure for such mutilation.

Aside, your user name here is after an organisation founded by one of world history's worst mass murderers. Can I suggest to show empathy with his victims, and not use this term? Using it trivialises his crimes.