Mega Ureters

A megaureter means “big ureter” and is a descriptive term, not a diagnosis.  The two important questions about megaureter are whether there is reflux (backwash) of urine causing the megaureter or whether there is blockage at the ureterovesical junction causing megaureter.  If there is reflux, the diagnosis is “refluxing megaureter” or “megaureter from reflux”.  If there is obstruction, the diagnosis is “obstructed megaureter” or “primary obstructed megaureter”.  If there is neither reflux or obstruction, then the diagnosis is “primary non-obstructed megaureter”.  In very rare circumstances, there can be reflux and obstruction and the diagnosis is “refluxing obstructed megaureter”.  The two most common types of megaureter by far are the “primary non-obstructed megaureter” and the “refluxing megaureter”. 

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