I'm no expert, but it seems to me that with 4 freakin x-rays and a stone did not show up, is that what I'm reading, so there is a good possibility there is no stone. AND, who said, there was an invisible bladder stone? Sorry it took me so long to see this, how is she now?Hahaha!!! ??. Yep.. they gave me 4 of those last time too!! Showed no impact stones or poop!!???? And yet..... here I am with those pictures??? WTH?? Maggie help!!!?? How can she have a stone and it not come up on xrays?? ?