My Brother Is 19 YeArs Old Patient Having Right Solitary

My brother is 19 yeArs old patient having right solitary kidney showing double moiety appearance the upper moiety shows severe dilatation grade 4 hydronephrosis with total loss of parenchymal thickness due to a vascular loop around the bifid ureter the lower moiety shows grade 2 to 3 hydronephrosis
Complete normal renal functions and symptomless
What is his approach