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One off my fnd got complete body check up, diagnosed with left kidney nephrosis & right kidney absolutely good - nephrosis more condition_symptoms

FNDS group visited the hospital for routine check, having undergone all the tests, ultrasound showed the left kidney problems later as counsel for the MRI taken to confirm the hydronephrosis of the left kidney outside the study of isotopic confirmation of details funtioning open to both kidneys basket, the result showed that no one leaves all in place, the right to a 100% working ...... ......
neprologist after advice was not to worry .... receive regular check-ups for at least 2 years .......
What precautions should be taken, wat r the characteristic symptoms, which should be taken into account. Wat is the reason for the loss of the left kidney .......... etc.