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Doctor insights on: Renal Ct Scan With Contrast

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Is there a lot of radiation associated with a CT scan with contrast for the renal area? Can the contrast cause an allergic reaction?

Is there a lot of radiation associated with a CT scan with contrast for the renal area? Can the contrast cause an allergic reaction?

No: CT of abdomen is a fairly routine test and not considered a radiation danger. Th incidence of allergic reaction to contrast is 1-3% with non-ionic agents and 4-12% with ionic contrast agents. Non-contrast agents are the type generally used today. The benefit from the diagnostic value of the test far exceeds the risk of these 2 issues. Hope this answers your question.

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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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What is a hyperdense renal cyst on a non contrast CT scan? No contrast because creatinine 1.49.

What is a hyperdense renal cyst on a non contrast CT scan? No contrast because creatinine 1.49.

Hyperdense cyst: On noncontrast CT scans, most simple kidney cysts look very dark or hypodense because the fluid inside of them is just like water. A hyperdense cyst looks much lighter or brighter compared to the kidney itself. This usually just means that there is high protein in the cyst or that the cyst has bled at some point.

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What is a hyperdense renal cyst on a non-contrast CT scan? Contrast not give b.c. creatinine 1.49.

What is a hyperdense renal cyst on a non-contrast CT scan? Contrast not give b.c. creatinine 1.49.

Protein: Hyperdense cysts can be associated with higher amounts of protein which will increase density. Sometimes these cysts may have a little blood or fibrin that may increase density. Calcium in the wall of the cyst is easily seen and different from the other things

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I read in articles that the dye used for a contrast abdominal/renal CT scan can cause many severe side effects including renal damage/failure. True?

I read in articles that the dye used for a contrast abdominal/renal CT scan can cause many severe side effects including renal damage/failure. True?

True: IV contrast can cause severe allergic reactions in some people, especially those allergic to iodine or shellfish. IV contrast is removed from the body by the kidneys. If one is dehydrated or has baseline kidney dysfunction, administration of contrast may worsen kidney function, leading to temporary or permanent kidney failure

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What does it mean when a renal CT scan shows, thinning of the cortex, punctate calcification (with no stones), and contrast extending into the calyx.

What does it mean when a renal CT scan shows, thinning of the cortex, punctate calcification (with no stones), and contrast extending into the calyx.

Atrophy: Renal cortical thinning is seen due to functional loss of nephrons. There are many causes of "medical renal disease"which result in atrophy. Hypertension is the leading cause. Punctuate calcification s are very tiny stones. Contrast is supposed to be in the calyx, so I'm uncertain why that was stated. Was there anything else related to that statement?

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Just had a ct scan done with contrast it showed left adrenal adenoma 1.7 cm. Small renal hypodensities left kidney. 1cmcomplex cyst left kidney should I be worried?

Just had a ct scan done with contrast it showed left adrenal adenoma 1.7 cm. Small renal hypodensities left kidney. 1cmcomplex cyst left kidney should I be worried?

Likely no, but..: What you report are largely seen incidental findings but a few loose ends here should be addressed to make sure there is nothing more insidious ie. How complex exactly is that left renal cyst? also, an adrenal adenoma cannot be definitely diagnosis on a contrast enhanced scan unless a very specific protocol was followed. Feel free to schedule a consult and we can review your CT and the details.

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Ct scan w/ contrast results say 1) renal parapelvic cysts & 2) defect right posterior diaphragm with herniation of fat into the right posterior costophrenic sulcus. What does this mean?

Ct scan w/ contrast results say 1) renal parapelvic cysts & 2) defect right posterior diaphragm with herniation of fat into the right posterior costophrenic sulcus. What does this mean?

Relatively common: The parapelvic renal cyst is a relatively common finding on routine urological examination but rarely needs treatment, unless it causes pyelonephritis, symptomatic renal stones or back discomfort.

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Ct scan results (abdomen with contrast) say renal cell carcinoma and lesion mass. What should I do? (age 83years. Previously used to smoke heavily)

Ct scan results (abdomen with contrast) say renal cell carcinoma and lesion mass. What should I do? (age 83years. Previously used to smoke heavily)

Talk to oncologist: To make a plan that fits in with the way you want to live your life. There are many aggressive options, and there are alternative options. Make sure you discuss all your wishes with your family so they are all on the same page as you are. Good luck with everything, and best wishes!

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What is bilateral renal excretion? Results reported on a CT scan.

What is bilateral renal excretion? Results reported on a CT scan.

Excretion is normal.: The kidneys excrete (produce, emit) urine under normal circumstances. When you have a CT scan, the contrast ('dye') you were given through your vein is excreted along with the urine from the blood stream. The 'dye' outlines your kidneys, ureters, and bladder (your 'plumbing') for the radiologist. To see.

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My CT scan reported small left renal calculus! What could this mean? Kindly elaborate.

My CT scan reported small left renal calculus! What could this mean? Kindly elaborate.

Kidney stone: It may never cause problems or it might pass into the ureter at some point and cause pain and possibly some blood in the urine.

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USS July diagnosed 3.8 CM simple L renal cyst. Renal CT scan yesterday showed 3cm exophytic mass arising from L upper pole looks like a cyst?? CA

USS July diagnosed 3.8 CM simple L renal cyst. Renal CT scan yesterday showed 3cm exophytic mass arising from L upper pole looks like a cyst?? CA

Tissue is the issue: Hi. Diagnosis of what the renal mass is requires tissue for the pathologist to examine. Imaging studies may be suggestive or not, but to be certain, a pathologist must study a CT- or U/S-guided core biopsy of the mass. Sometimes surgical biopsy is necessary to determine whether benign or malignant. We don't have the means to make that determination. The mass may not be suspicious enough to biopsy

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Ct scan false negative? 2012 renal US found 5mm solid lesion (likely aml). New US found bilateral lesions, avascular. 5mm now 7mm. New 1cm, CT normal

Ct scan false negative? 2012 renal US found 5mm solid lesion (likely aml). New US found bilateral lesions, avascular. 5mm now 7mm. New 1cm, CT normal

Renal cysts: Renal cysts are common in people over the age of 50, and are not significant. I don't know what AML stands for. A solid lesion needs a repeat study after a few months to show that it is not getting larger. You should review the CT report with your physician

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M58, CT scan says "bilateral renal cortical cyst noted. The largest cyst at the upper pole of the left kidney measures 3.8x5 cm." Is this significiant?

M58, CT scan says "bilateral renal cortical cyst noted. The largest cyst at the upper pole of the left kidney measures 3.8x5 cm." Is this significiant?

Probably not: The majority of people develop a few kidney cysts, especially by the time we reach your age. They are usually benign. A kidney ultrasound would better characterize if it is a simple cyst (benign) or not, especially if there was no IV contrast in the CT scan. It should be noted how many cysts were found, which was not apparent in your description, so I'm only assuming one on each kidney.

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Can I fly two days after doing a angio CT scan to the renal artery?

Can I fly two days after doing a angio CT scan to the renal artery?

CTA: CTA is noninvasive, the only issue is Kidney function, CTA need a decent dye load, if your kidney is stable post CTA, most patient can resume daily activity right away. This is based on the assumption, you only had a CTA and no intervention was done. If an intervention is done, you should D/W your MD.

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Which is better at evaluating complex renal cysts in children - CT scan or mri? Is the bosniak scale used in children?

Which is better at evaluating complex renal cysts in children - CT scan or mri? Is the bosniak scale used in children?

Reasonable F/U...: Either one should be sufficient for evaluation after suspecting cystic lesion in kidneys of children, which can be categorized with bosniak system. After that, no further ct or MRI is needed but annual renal us in 1 yr for 1-2 times. If stable and asymptomatic with normal us, further study is usually unnecessary. Of course, beware of unwanted radiation to the children.

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History of renal stones, pain in right side. CT scan clear. Blood test results clear except for low magnesium 0.79mmol/L. What does it mean?

History of renal stones, pain in right side. CT scan clear. Blood test results clear except for low magnesium 0.79mmol/L. What does it mean?

Magnesium: Low magnesium has been associated with calcium oxalate kidney stones. Magnesium can inhibit the formation of calcium oxalate in the urine. It can also reduce blood calcium oxalate levels. It has been shown that taking oral magnesium and vitamin B6, an inhibitor of calcium oxalate metabolism can decrease the incidence of stones. See a kidney specialist for a stone work up.

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Pelvic CT scan showed mild dilation of the renal collection system bilaterally. No obstruction was seen on a retro-peritoneal u/s. Is this serious?

Pelvic CT scan showed mild dilation of the renal collection system bilaterally. No obstruction was seen on a retro-peritoneal u/s. Is this serious?

Not likely: The renal collecting systems collect the urine made by the kidneys. Urine then travels through the ureters to the bladder. If the collecting systems become dilated, it can mean there is something blocking the pathway (e.g., kidney stone, mass, scarring). There is a range of normal and even mild dilatation can be ok. Blood tests can also be used to ensure normal kidney function.

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Dr. Michael Gabor
1,854 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