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://parisnaturalfoodes.shop/product-category/vitamin-e-200iu/