russian tortoises shell

Question
My russian tortoises shell on her underbelly is missing a piece I do not know what happened, what would cause this.

Answer
I am not sure what you mean...

A scute (scale) is missing? This can be due to injury or shell rot. If the tissue under the missing scute is pitted, discolored, soft, or otherwise abnormal, it could be a sign of one of the many forms of shell rot.

There is a hole or opening in the shell into the tortoise? This is usually due to an injury.

You can write me back with more details, but if you want a more interactive format that can handle this sort of thing better, try http://www.turtleforum.com

Good luck!