Time to play!  : the answer
Thank you for your comments and suggested diagnoses on the bladder of this cat presented for hematuria! I hope you enjoyed it!
The marked cranioventral thickening of the bladder wall (with a layered appearance) supports cystitis. In addition, there is marked irregularity of the mucosal surface; this is highly supportive of ulcerations that leads to bleeding. Hyperechoic material is adherent to the ventral wall, despite the cat lying down on its back.
During the video, a small part of the material is falling on the dependent aspect of the bladder lumen. Some of these changes mimic membranes crossing the lumen. Notice the acoustic shadowing that supports mineralization.
Radiographs are helpful in confirming the presence of mineralized sediment, with irregular margins.
This uncommon condition is reported associated with Corynebacterium Urealyticum infection.
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