I am not a urologist, so my insight into this question is limited.
Causes of hydronephrosis is caused by of obstruction. In patients with a positve renal scan as well as symptoms, surgical correction is normally recommended. Casues of hydronephrosis that is not corrected may lead to permanent kidney damage.
Before undergoing surgery, it may be wise to obtain another urological opinion - preferably at a major academic medical center.
This option can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_