What can cause hydronephrosis in kidney?
Patient: sir recenly my kidny stone operation is done of ledt kidny for the 14mm stone ,it is removed  and one tube is inserted in between kidny to pu junction......... after that a 6 mm stone is present in lower side of the kidny doctor tell this stone remove by tablets in few days ......then after 20 days doctor check the stone by using sonography....it is remove but the report shows the mild hydronephrosis in left kidny.....please tell me causes of that and tretment ...........iam confused  it generate because of pipe.....but in this i have small pain if larg physical activity please help me ............ Doctor: Hi,  Hydronephrosis is nothing but fluid collection in kidneys. It is quite common after surgical procedures and in your case, it is mild and will settle in a couple of weeks. No treatment is required. Wishing you good health.  Hope I have answered your query. Let me know if I can assist you further.