title: Retroperitoneal mass and hydronephrosis.
authors.affiliation: Department of Surgery, Saint Barnabas Medical Center, Livingston, New Jersey, USA.
authors.forename: R G
authors.initials: RG
authors.lastname: Frank
mesh_terms: D002137:Calculi / Q000150:complications* / Q000175:diagnosis*; D006801:Humans; D006869:Hydronephrosis / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D009135:Muscular Diseases / Q000150:complications / Q000175:diagnosis; D016658:Psoas Muscles