Frequently nocturnal and swollen feet, is it renal cysts?

Hello, recently my father frequently nocturnal, he said that sometimes do not pee out of swollen feet, renal cysts may be it?

Kidney cyst symptoms are not, frequent nocturia, urine does not come out, swollen feet, consider nephritis syndrome, kidney function should be further investigation.

Recommendations to the hospital to be a B-ultrasound