title: Preoperative identification of a hydronephrotic sac with sequential  99m Tc DTPA imaging: case report.
mesh_terms: D002675:Child, Preschool; D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D009392:Nephrectomy; D004369:Pentetic Acid; D011877:Radionuclide Imaging; D013667:Technetium; D014546:Urinary Catheterization; D014567:Urography
chemical_list: D013667:Technetium; D004369:Pentetic Acid