title: Scintigraphic detection of 'yo-yo' phenomenon in incomplete ureteric duplication.
abstract: 'Yo-yo' reflux in an incompletely duplicated renal system was demonstrated on (99m)Tc-mercaptoacetyltriglycine (MAG3) renal scintigraphy in a 7-year-old girl presenting with low-grade fever and pyelonephritis. Incomplete duplication and a bifid renal pelvis, which may be seen in up to 4% of the North American population, occasionally causes symptoms because of recurrent urinary tract infection or loin pain. (99m)Tc-MAG3 renal scintigraphy can demonstrate 'yo-yo' reflux in patients with incomplete renal duplication and should be considered in cases with unexplained loin pain, even if (99m)Tc-dimercaptosuccinic acid (DMSA) renal scintigraphy is normal.
authors.affiliation: Department of Diagnostic Radiology and Organ Imaging, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, China. winnie@ruby.med.cuhk.edu.hk
authors.forename: Winnie C W
authors.initials: WC
authors.lastname: Chu
authors.forename: Kam-Wing
authors.initials: KW
authors.lastname: Chan
authors.forename: Constantine
authors.initials: C
authors.lastname: Metreweli
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D019783:Technetium Tc 99m Dimercaptosuccinic Acid; D014513:Ureter / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D014718:Vesico-Ureteral Reflux / Q000175:diagnosis*
chemical_list: D019275:Radiopharmaceuticals; D019783:Technetium Tc 99m Dimercaptosuccinic Acid