Hi Doctor, My Son Is Only Maybe 18 Years Old

hi doctor, my son is only maybe 18 years old or younger, he has hypertension ranging from 140/90 all the time, the doctor finally discovered that he has stenosis of the kidney, his cholesterol is very normal, what is the treatment for this problem? his doctor gave him hypertension med, and its working, his bp is normal now, my question is in the long run this kidney stenosis needs to be treated like giving him the stent, or if his doctor did not do anything only medication, do I need to worry about my son condition? he is now 23 years old