Will Kidney Stone Surgery Cause Further Damage?

Dear Sir, Below is the report of my wife CT SCAN CONTRAST My question is for KIDNEY damage that how much chances are there if kidney stone operation done successfully, means as of now kidney is works or not works. MSCT SCAN OF KUB MSCT imaging was performed using submillimeter thin contiguous axial scan of KUB with oral and I.V. contrast. Coronal and sagittal Reformatted images were obtained. FINDINGS/OBSERVATIONS: Right kidney and ureter: RK measures :72 x 36 mm 4 mm sized calculus (800 HU) is noted in lower calyx of right kidney. Rightkidney shows moderate hydronephrosis with dilated upper ureter with presence of 11.5 x 7 mm sized calculus (1400hu) approximately 3.6 cm distal to the right PUJ. There is seen multiple cortical scarring and thinning of parenchyma involving the right kidney. No renal mass or other lesions. N Left kidney and ureter: LK measures :107x50 mm. No calculi. No hydronephrosis or hydroureter. No renal mass or other lesions. No urothelial lesions: No filling defect, dilation, stricture or wall thickening. Urinary bladder: Well distended. No evidence of calculi or obvious mass lesion. On post-contrast study, both the kidneys shows normal post-contrast enhancement and simultaneous excretion. IMPRESSION: 1. Right kidney shows moderate hydronephrosis with dilated upper ureter with presence of 11.5 x 7 mm sized calculus (1400hu) approximately 3.6 cm distal to the right PUJ. 2. Multiple cortical scarring and thinning of parenchyma involving the right kidney.