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Doctor insights on: How Well Do Kidney Stones Show In A Ct Scan Without Contrast

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How well do kidney stones show in a CT scan without contrast?

How well do kidney stones show in a CT scan without contrast?

Very Well: Almost all kidney stones show up extremely well on a non-contrasted ct scan. A stone that was composed entirely of protein matrix may not show but the typical calcium oxalate, calcium phosphate, and uric acid stones show up very well. ...Read more

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Dr. Andrew Seibert
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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 had a CT scan without contrast would kidney stones show up ...

If i had a CT scan without contrast would kidney stones show up ...

Yes: In fact, ct scanning without contrast is becoming the gold standard evaluation for kidney stones. Contrast material frequently obscures stones and makes their identification difficult. Stones as small as 1 mm can be detected with unenhanced ct technique. Radiolucent stones which cannot be seen well with plain x-ray technique do show up well with unenhanced ct scan. ...Read more

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Would kidney stones show up on a CT scan if i hadn't been given contrast fluids to drink?

Would kidney stones show up on a CT scan if i hadn't been given contrast fluids to drink?

yes!: Yes- that is exactly how a ct for renal stones should be performed- with oral or IV contrast. ...Read more

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Does a CT scan always show iup kidney stones?

Does a CT scan always show iup kidney stones?

Not always: This does depend on the size of the kidney stone and the way the study is performed. Suffice it to say almost always ...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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Is a kidney ultra sound good for spotting kidney stones or just it be a CT scan?

Is a kidney ultra sound good for spotting kidney stones or just it be a CT scan?

Ultrasound only fair: Ultrasound detected about a quarter of all stones seen on ct. Stones smaller than 4 mm were not well seen on ultrasound. Mean size of stones seen with ultrasound was about 7 mm. Main advantage of the ultrasound is the absence of radiation exposure. If you are of thin build, the ultrasound may be somewhat more sensitive. ...Read more

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Hi dr! i want to ask.. is it possible that a kidney stones was seen in ultrasound but can't be seen in ct scan with contrast?

Yes, because: it had probably passed in the meantime. Small stones generally pass. Most important for you is to prevent recurrence of stones. ...Read more

Dr. Michael Korona
1,791 doctors shared insights

Ct Scan (Definition)

Ct scan uses data from a beam of xrays and reconstructs a cross sectional image of your body. It is a high dose of xrays and used only when the benefits outweigh the risk. Cancer risk is 1 in 500 in children. Also using iodinated contrast might cause transient renal failure in about 5% of patients. (contrast induced nepropathy) most do not explain this to the patient as ...Read more


Dr. Abraham Jaskiel
64 doctors shared insights

Kidney Stones (Definition)

Seriously- renal stones are the result of postive and negatively charged particles in urine binding together and precipitating as solids- most frequently as calcium- oxalate. This happens most often when the urine is concentrated- ie when you are dehydrated. And trying to pass these stones from the kidney to the bladder is incredibly painful. ...Read more