<prompt> Retrocaval ureter occurs due to persistence of:Azygous veinHemiazygousAnterior cardinal veinPosterior cardinal vein  <response>: Retrocaval Ureter- Aka Circumcaval ureter- Abnormal development of IVC causes ureter to pass behind IVC and to take U turn before draining to bladder.- Abnormal persistence of right posterior subcardinal vein Clinical features- Signs symptoms of ureteric obstruction Diagnosis- MRI is IOC to a delineate anatomy clearly and non-invasively- IVP Reverse J Fish Hook Or Shepherd Crook deformity Treatment - Relocation ureteroureterostomy 