Abstract Background: Urinary bladder stones may be a primary stone formed in the urinary bladder or migrating calculus from the upper urinary tract. Bladder stones become more symptomatic when associated with infra-vesical obstruction. The most common cause of infra-vesical obstruction in elderly men is benign prostatic hyperplasia. https://www.nacrack.com/huge-sale-Moondrop-Quarks-quick-choice/