Last revised by Mostafa Elfeky on 29 May 2021

Hydroureter refers to abnormal dilation (>3 mm) of the ureter and may occur in combination with hydronephrosis

The term, megaureter, is usually reserved for ureters >7 mm in diameter. The term hydroureteronephrosis (or hydronephroureterosis) may be used when ureteric dilatation occurs in the presence of hydronephrosis

Clinical presentation is variable but may include:

  • flank pain
  • nausea, vomiting

Hydroureter is a non-specific finding. Etiologies include:

A ureteral diameter of >3 mm has been described as the cut-off for hydroureter 1,3.

From the Latin "hydro", meaning of water. 

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