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

Clinical presentation is variable but may include:

  • flank pain
  • nausea, vomiting



Hydroureter is a non-specific finding. Etiologies include:

Radiographic features

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

History and etymology

From the Latin "hydro", meaning of water.

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