HI.
Since the prostate is at the base of the urethra, the obstruction caused by an
enlarged prostate can cause back-pressure to cause reflux of the urine from the
urinary bladder to the ureters and up to the kidneys causing the changes you have seen in the
ultrasonography.
I would suggest such a patient the following.
To get a consultation of an
Urologist ( Surgeon ) for physical examination of the prostate by per-anal palpation by a finger to ascertain the size , consistency , tenderness and all relevant examination.
PSA and all other blood tests including kidney function tests and sugar.
Urine -routine, microscopy, culture and sensitivity tests.
If Cancer is suspected a core-biopsy may be needed as also Orchidectomy.
Prostatectomy as a treatment and as a specimen for biopsy.
This should solve your problem.