Welcome to HealthcareMagic forum.
Urine flow through the ureter
/ urinary bladder
can get obstructed in some conditions. They occur commonly in the presence of fairly large renal stones
. It appears your brother has similar kind of clinical situation here.
Kidney and pelvic ureter undergo some structural changes described as hydrouretero nephrosis
in such situations. When untreated, this change can go on to affect renal functions. But do not worry I see his renal functions are within normal limit.
Absence of physical pain now is a good indication. The stone should probably have been discharged now. I expect this condition to reverse very soon. You can plan to repeat the renal function test with or without an ultrasound
abdomen/pelvis to confirm the same.
Hope this helps. If you have any more information, you are welcome to post them to me.