I have a 4.2mm and 4.5mm kidney stone in my left kidney with hydronephrosis and calyceal separation of 9mm. My prevoid volume is 289cc and PVR is 20cc which they say is insignificant. Can you explain what the 9mm and 20cc measurements mean? Do I need surgery for this or can it be treated with medication?

Answered by 1 Apollo Doctors

Dr Dhankecha Dineshbhai

General Practitioner

MBBS
6+ Yrs

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The 9mm refers to hydronephrosis severity, and 20cc PVR is normal; stones this size often pass or dissolve with meds.

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Answered 14/08/2025

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