Hi,we need to do ct scan of abdomen to know whether it is simple cyst
or multiple cyst of kidney.if it is simple cyst do not worry.if it is multiple cyst than we have to check whether it is polycystic kidney
disease this can be inherited.investigations needed are sr creatinine
,24hr urine protein,urine routine.ultrasound
of siblings & yours.with this investigations you will get answer dont worry.