my son is 16years old and he had grade 1 reflux at the age of 1 year six months old, he was treated with medication with septran 1.25ml for a year and after that he did not have any problem even after frequent check ups, Now we did abdominal scan of the kidney and ureter and found that his left kidney is mild hydronephrosis and his left ureter has collapsed. How can it be rectified is it a major problem has I heard that his kidneys may damage if left untreated.