21 year old male presented with a history of haematuria and dysuria for the last 1 year.
On ultrasound, on full bladder (430cc), the wall is thickened and irregular. The post-void volume is high.
These are consistent with cystitis.
In addition, there is a small diverticulum at the right lateral wall.

Bladder diverticulum is an outpouching from the bladder wall, whereby mucosa herniates through the bladder wall. It can be congenital or acquired. Congenital diverticulae are solitary and are most often discovered during childhood. Acquired bladder diverticulae are the result obstruction of the bladder outlet or bladder dysfunction. They are often multiple and typically seen in older men.
Bladder diverticulum results in stagnation of urine. This can be a source for bacteria and results in frequent urinary tract infection.

Acknowledgement: Dr Prakash, Klinik Berjaya Medic, Shah Alam, Selangor