Women large jaw .com

Square jawed woman image attachment: 

seriously speaking is there any known link to a genetic skull deformity known as chiari malformation related to large jaw structure ? i ask due to the latter condition being the skull is to small therefore displacing the end of the brainstem
and basically herniating it...odd that is the problem yet a very large jaw in the front of facial features does not seem to affect??? i know a lady with this and a very large jaw hope we can see if there is a medical genetic bone structure link