What does it mean that there is no obvious blood flow signal in the bladder?

Bladder stones refer to

solid crystalline material formed in the bladder. Because

there is no blood supply, no obvious

blood flow signal can be found. Bladder diverticulum refers to the bulging of the bladder wall

, forming a bag-like structure. Due to the existence of diverticulum, the blood flow signal inside the bladder may be disturbed by local structures, and there may be no obvious blood flow signal.