<s>[INST] I have 25% function in my left kidney and have passed many stones, the last stone blocked the Uretha and had to be blasted. Due to the condition of my kidney they say they can not blast the stone in the kidney, it is a staghorn 35mm. I have 75% function in the right kidney. I have renal scaring in both. Based on this what options other that kidney removal would you suggest I ask my specialist, he isn t a very easy dr to talk to but a good surgeon, so just looking for as much info as I can. Thank you [/INST] Hi, Thanks for writing in. Staghorn stones are big distorted stones and can cause significant adverse effects on the kidney function if not treated. That is the possible reason for your kidney functioning at 75 percent. A stone of size 35 mm is big and should be removed to maintain the remaining functioning of the kidney. There are surgical as well as minimally invasive ways to treat your condition. A percutaneous nephrolithotomy can be done. In this an incision is made in the kidney region and the staghorn calculus is removed surgically. Extracorporeal shockwaves can be used to break the stones. Otherwise, a double J stent can be kept in place to maintain the flow of urine while attempts can be made to allow the stone to be removed piecemeal. It is also possible that </s>