The renal ultrasound and kub X-ray shows no stones in kidneys or gall bladder but a urinal stone. What might be the reason?

? bladder stone. I am not quite sure but here is a possibility. Us and kub are not as sensitive as a ct study for small kidney stones, stones in the ureters or in the urinary bladder. The urinal stone might have been in the urinary bladder.
Urinal in bathroom. I assume you mean a urethral stone or maybe something else but a urinal is not an anatomic structure. Stones come in all sizes and may spontaneously pass. Stones may originate anywhere along the urinary system but many start in he kidneys and pass through te ureters to the bladder and then the urethra on their way out of the body. Youse have caught one in transit or it may be stuck. If latter it.

Related Questions

Does an ivp X-ray show kidney stones when they don't show up on a kub X-ray and can someone still have a stone if none is seen on a kub x-ray?

CT scan is better. Ct scan is now preferred test for kidney stones. Radio opaque stone can be seen on kub is the stone is big enough for x ray; ct can detect smaller ones. Ivp rarely being used. Read more...
Yes. Ivp xray can show stones not visible on kub x ray. Best is to perform an non contrast ct scan. Some stones like uric acid and pigment stones do not show up on a x ray. Read more...

Kub X-ray showed no stone I am still having severe pain at night on my left side could it still be a kidney stone?

Yes. Depending on size and composition stones might not be visible by x rays, see your doctor for persistent pain. Read more...
Possible. Not all kidney stones show up on x-ray. If the pain is only at night it is not likely to be a stone. You should see your doctor for a proper work-up. Read more...
Probably not.. A kidney stone on the move will not spare you pain during day--it hurts day or night. Since you only experience pain at night, something else is causing your pain. Kub is a so so test for kidney stone, but your pain pattern does not fit. It is difficult to tell what you have based on the limited info provided. Please consult doc for re-evaluation and possible additional testing. Good luck. Read more...

Need doctor's help! Will kidney stones be missed on a kub x-ray?

Sometimes. There can be obscuration of kidney stones by a large amount of stool in the colon, calcifications in other structures like lymph nodes or arteries. Small kidney stones may thus be missed. Some stones are not very radiopaque and will not show up clearly on the kub. Such stones are better seen on ct. Read more...

I have been sick with ureter stone and it was detected by kub x-ray, ultrsound and CT scan. After a time kub xray couldn't detect it. How it could be?

Stone may have passe. A couple of possibilities are that the stone has passed and is no longer there. Another possibility is that the stone is just obscured and not able to be seen. This could be due to overlying bony structures or stool. Sometimes if the image is blurry, small stones can be very difficult to see even if they are still present. Read more...
CT more sensitive. Ct is much more sensitive for detecting ureteral stones than a kub xray. Also the stone may have moved from the ureter to the bladder, or may have passed from the body entirely. On a kub, stones can be obscured by bowel contents or by overlying bony structures if it has moved into the pelvis. Read more...