Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
Most of the times,
kidney stones less than 7 mm will pass easily through urine. Hence the stone detected with 4 mm might have been passed through in urine.
Also, if the resolution of the
ultrasound scan machine is less, it might be difficult for
radiologist to pick up stones of about 4 mm and hence could miss it, reporting as normal scan.
Since 4 mm stones do not obstruct and pass easily through ureters in urine, you need not worry about it.
Kindly drink good quantities of water and keep your urine more alkaline by consuming syrup like Citralka and taking fruit juices rich in
vitamin C like cranberry or orange juice regularly. This would also help in preventing further stone formation in future.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Ashakiran S