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Doctor insights on: Kidney Stone Not Showing Up On Ct Scan

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How do I know if I've passed a kidney stone without another CT scan?

How do I know if I've passed a kidney stone without another CT scan?

Capture it: Hopefully, you were screening your urine and caught the stone. If the scan showed a 3 mm stone and you captured a 3mm stone, that is good enough. You should be pain free and a check of your urine from your doctor should show that the blood has cleared. ...Read more

Dr. Andrew Berry
1 Doctor shared a insight

Computed Tomography (Definition)

Ct uses xrays taken an 360 degrees combined with a computer to see"inside" the body. The table moves as the xray tube and detectors spin around the patient 10 times a second or more! The image shows excellent soft tissue detail, enhanced with injection of intravenous contrast or oral contrast. This way the body is shown in slices, in any plane, usually axially, but ...Read more


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If I already know I have a kidney stone is it necessary to have a CT scan?

If I already know I have a kidney stone is it necessary to have a CT scan?

Possibly: If you know you have a kidney stone, a ct scan is not necessary unless symptoms develop. If the person remians asymptomatic, periodic imaging with ultrasound or other x-rays are adequate. However, small stones may be missed on these studies and a ct scan may be required to locate the stone. ...Read more

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CT scan shows 4mm kidney stone on wall of my kidney. No sign of it passing soon w/o forcing fluids. Will it continue to grow if not passed?

CT scan shows 4mm kidney stone on wall of my kidney. No sign of it passing soon w/o forcing fluids. Will it continue to grow if not passed?

Kidney stone.: If left alone, it is likely to grow. Usually the largest size kidney stone that’ll pass without intervention is 5-6mm. ...Read more

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On a CT scan is it easy to tell a 10mm kidney stone from a tumor. Could they be mistaken?

On a CT scan is it easy to tell a 10mm kidney stone from a tumor. Could they be mistaken?

Not usually: Bobcat: a kidney stone shows up on the ct scan as a bright white spot and the density is measured to insure that it is a calcium deposit/stone. A mass/tumor can have calcifications in it, but the mass would typically be seen and not just the calcium. It may also matter whether you ct was done with and without contrast injection to be sure the stone is not obstructing the urinary tract. ...Read more

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I had a CT scan done for a kidney stone. It says there appears to be interval thinning of left cortex at the poles. What does that mean?

I had a CT scan done for a kidney stone. It says there appears to be interval thinning of left cortex at the poles. What does that mean?

Renal scarring: The upper and lower poles of the kidney or more vulnerable to scarring secondary to reflux. This may have occurred earlier in life secondary to a febrile urinary track infection characteristic for pyelonephritis which during the healing process can lead to scarring. You cannot eliminate scarring once present but you can help to prevent further urinary tract infections specifically with fever. ...Read more

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After 2 wks, docs say kidney stone passed since ct scan showed up clear. 3 days later still having pain (not as excruciating but constant). Is normal?

After 2 wks, docs say kidney stone passed since ct scan showed up clear. 3 days later still having pain (not as excruciating but constant). Is normal?

See rmark: If the CT showed NO STONE the discomfort/pain may be resultant of stone passing, as it "scratches the lining of the ureter. Drink enough fluids. I advise you drink a glass of lemonade in AM and one glass in PM.
I don't know the nature of your stone, but lemonade which contains CITRIC ACID does help prevent future ones.......Best of luck young lady. JBR ...Read more

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My husband just had a us that showed one kidney stone and a shadow on his kidney. He has a ct scan scheduled for Monday. What could the shadow be. I a?

My husband just had a us that showed one kidney stone and a shadow on his kidney. He has a ct scan scheduled for Monday. What could the shadow be. I a?

Shadows are caused: By calcifications/stones on ultrasound normally. Like a solar eclipse of sorts. The ultrasound waves bounce off the stone so the area below the stone appears to be in a shadowed area. ...Read more

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Is it possible to see kidney stone with MRI or CT scan?

Yes: Noncontrast ct is the most sensitive and specific noninvasive exam for finding kidney stones. Mri (more specifically mr urogram) may find them, as well, but it is less common to order this test. ...Read more

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How can a CT scan tell if you have a kidney stone or cancer or something else?

How can a CT scan tell if you have a kidney stone or cancer or something else?

It shows the kidney: The ct scan that is typically done to look for kidney stones is done without any intravenous contrast. Almost all stones show up easily on ct scan. Renal masses typically show on a non-contrasted ct but they may not be able to tell if it is a cancer or not. The ct also shows other organs in the abdomen and a mass or cancer may be visible on the study. ...Read more

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I have back pain, had CT scan, they sure it was kidney stone but couldn't see it, no pain after but today I do?

Follow up: There are often residual changes in the urinary tract soon after a stone passes. However, they should normalize in a few days or weeks. If you still have back pain, that usually means there are other reasons, that you need to discuss with your doctor. ...Read more

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Went to the ER Friday night and they did a CT scan and said I am passing a kidney stone, how long is it usually before it passes?

Went to the ER Friday night and they did a CT scan and said I am passing a kidney stone, how long is it usually before it passes?

Variable: Days or weeks.
Size, location are relevant to passing.
Some require intervention by lithotripsy, or surgery if nit passing with pain control and fluids.
Also need to try to determine type, cause and prevention!! ...Read more

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My CT scan shows oval shaped 10.9 mm vs 4.5 mm kidney stone in the upper ureter, with a good orientation. What chances of passing?

Unlikely: 11mm stone is very unlikely to pass on its own. Hopefully you are under the care of a urologist. Good luck. ...Read more

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Can I tell if kidney stone has transited from ureter to bladder by change in symptoms? CT scan shows a 4mm stone 1.5 CM from bladder.

Can I tell if kidney stone has transited from ureter to bladder by change in symptoms? CT scan shows a 4mm stone 1.5 CM from bladder.

See answer: The only true accurate means of determining whether a ureteral calculus has passed is to retrieve it by straining your urine. The chance of spontaneous passage of a 4mm stone ~50-60%. Onset of symptoms of urinary urgency, frequency, burning, voiding small volumes usually indicates the stone is at the UVJ (ureter meets bladder). The absence or disappearance of pain does not guarantee stone passage. ...Read more

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I have a CT scan with a 3mm kidney stone, unobstructive causing considerable pain for over 3 weeks and have not seen a urologist. What should I do?

I have a CT scan with a 3mm kidney stone, unobstructive causing considerable pain for over 3 weeks and have not seen a urologist. What should I do?

Stones: A few pertinent facts about kidney stones: 1. Stones 5mm or less have a 66 to 85% chance of spontaneous passage. 2. Non-obstructing calculi do not cause pain. 3. Stones can move in and out of obstructing positions. 4. A urologist can be helpful even if the stone is likely to pass spontaneously, by appropriately medicating pain and prescribing a medication that may help some stones to pass. ...Read more

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I had a CT scan for pain near left kidney. Told there is a hypodense lesion of 1.5cm and a hyperdense lesion of. 5cm. Could this be from kidney stone?

I had a CT scan for pain near left kidney. Told there is a hypodense lesion of 1.5cm and a hyperdense lesion of. 5cm. Could this be from kidney stone?

Kidney radiology: JHerbert, hello I want to start by saying that I'm a Family Practice doctor and also worked as an ER doc for 5 years. I am not a radiologist and I hope if there's a radiologist on HealthTap they will respond to you. That said I believe kidney stones tend to be hyperdense and the size of. 5cm is about right as well. A hypodense lesion may be a cyst but I suggest waiting for the official read. ...Read more

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Could a gall stone be mistaken for a kidney stone on a CT scan.?

Could a gall stone be mistaken for a kidney stone on a CT scan.?

No.: Ct scans precisely define the anatomy of different organs in the abdominal cavity. I can safely state that it would be impossible to confuse a gallstone from a kidney stone on a ct scan. ...Read more

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I had a CT scan they found a very small kidney stone in my bladder. Could that be anything else?

I had a CT scan they found a very small kidney stone in my bladder. Could that be anything else?

Stones: Finding a small kidney stone in the "bladder" suggests that the stone has already passed into the bladder and will easily pass out in the urine flow. ...Read more

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Could this be a Kidney stone RBC-17/HPF, RBC-5/HPF, Leuk Est-Moderate. Also a 1.2 cm cyst was found in my kidney on a ct scan,?

Could this be a Kidney stone RBC-17/HPF, RBC-5/HPF, Leuk Est-Moderate. Also a 1.2 cm cyst was found in my kidney on a ct scan,?

Could be: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, it could be from kidney stone but also could be due to other reasons and you should discuss it with the doctor who ordered the tests as s/he knows more about your health.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex. ...Read more

Kidney (Definition)

The kidneys are paired organs that lie on either side of the vertebral column. Part of their critical functions include the excretion of urine and removal of nitrogenous wastes products from the blood. They regulate acid-base, electrolyte, fluid balance and blood pressure. Through hormonal signals, the kidneys control the ...Read more


Kidney Stone (Definition)

Solutes precipitate and combine to form stones formed of calcium oxalate usually around a nidus of uric acid. Other solutes that form stones are ca and mg phosphates, cystine, and uric acid staghorn calculi form in the presence of chronic urinary tract infections. Stones can be painful, may require ...Read more