A 39-year-old female asked:
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can i still have kidney stones even if they don't show up on a ct scan?

5 doctor answers
Dr. Edward Neilsen
19 years experience Family Medicine
Yes, but: Kidney stones that do not contain calcium may not show up very well on a ct. However, these would need to be very small, so whether they are clinically signifcant is questionable. If the ct says no stone, the chances are good that either there is no stone, or it is too small to be worrisome.
Answered on Mar 28, 2017
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4 thanks
Dr. Madhu Kandarpa
9 years experience Nephrology and Dialysis
Small ones: Smaller than may be 5mm.
Answered on Sep 28, 2016
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2 thanks
Dr. Jason Hemming
17 years experience Gastroenterology
? contrast: Small stones can be missed. But if the ct was not a stone-protocol (i.e. Done with contrast) then stones may be missed.
Answered on Mar 9, 2019
4
4 thanks
Dr. George Klauber
Specializes in Pediatric Urology
Only tiny ones: Stones 3mm or greater should be visible on ct unless the "slices" are widely spaced.
Answered on Nov 2, 2012
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1 thank
Dr. Susan Wingo
33 years experience Endocrinology
Possible, not likely: Most kidney stones contain calcium and show up very clearly on ct scan. Some, however, are made up of uric acid and don't show up directly. If they are blocking fluid from moving through the ureter, the ureter above the blockage will be stretched out or dilated, and this is easy to see on ct. So even though some stones don't show up, ones large enough to block the ureter can be detected.
Answered on Nov 2, 2012
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1 thank

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