Intermittent hydronephrosis as a cause of a false-negative pressure-flow study

William G. Horstman, Michael D. Darcy

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


A case is reported of a negative pressure-flow study in a patient with intermittent hydronephorosis. This is the first known report of a properly performed pressure-flow study failing to diagnose obstruction due to the intermittent nature of the obstruction itself. This case also supports the concept that the ureteropelvic junction (UPJ) can be intrinsically normal in patients with intermittent hydronephrosis secondary to a crossing renal vessel. It also reaffirms the need to study these patients while they are symptomatic.

Original languageEnglish
Pages (from-to)185-187
Number of pages3
JournalCardiovascular and Interventional Radiology
Issue number3
StatePublished - May 1 1991


  • Hydronephrosis
  • Obstruction, ureteral pelvic junction
  • Urinary tract obstruction
  • Whitaker test


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