This video demonstrate laparoscopic pyeloplasty surgery performed at World Laparoscopy Hospital. PUJ obstruction may occur as a result of abnormal development of the kidney. It may be due to 'kinking' of the ureter over an extra blood vessel supplying the lower part of the kidney in about a third of cases. The obstruction varies in severity, and although it may have been life-long, it may not become symptomatic for many years. For this reason, it can be diagnosed at any age.