Bladder diverticula don't always need to be treated if they're not causing any problems. Diverticula caused by a block in the bladder are treated by taking out the block and maybe the diverticulum, as well. The surgery can be done by open surgery or through small tubes fed inside the bladder. A robot may be used to help with the surgery. Sometimes surgery on the outside of the bladder will also be needed. This surgery may be hard if the diverticulum has been infected and is swollen. For patients who can't have open surgery, the opening of the diverticulum into the bladder can be made larger. Samples of any tumors found in a diverticulum are tested for cancer.