Ophelia is a 12 year old spayed female domestic short hair cat who had a long history of frequent attempts to urinate and urinating outside of her litter box.  In this case repeated urinalyses did not reveal any evidence of an underlying cause for her behavior.

Xrays and ultrasound identified the presence of these 4 bladder stones which were removed surgically.  The top stone very much resembled the head of a mace, a weapon of midieval time, looking like a ball with many pointed spikes on it (attached to a metal shaft and wooden handle).  The smaller stones were in the process of developing spikes as well.