Hernia of the ureter is an uncommon condition and may classified into two types in relation to the peritoneum: extraperitoneal (without hernial sac) and paraperitoneal (with permeable peritoneum and redundant sac). This condition is generally asymptomatic and may be detected incidentally during urography or herniorrhaphy. We report on a case that had been detected during radiologic control evaluation of a left percutaneous nephrostomy prior to treatment with ESWL of a calculus in the ipsilateral lumbar ureter.