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Doctor insights on: Is Ct Or Mri Contrast Safe With Porphyria

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I have acute porphyria:  can I do the following:   take a flu shot, donate my organs, take a cat scan with the contrast? 

I have acute porphyria:  can I do the following:   take a flu shot, donate my organs, take a cat scan with the contrast? 

Yes& no: Now that swine flu vaccinations have begun in some areas, members with acute porphyria (aip, vp, hcp & adp) will be relieved to know that it is fine for them to receive flu and other vaccines. In fact, since other illnesses can bring on a porphyria attack, remaining healthy is one of the most important ways to prevent acute attacks. No organ donnation?No if you allergic to idione? ...Read more

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Dr. Adam Lewis
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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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Is it safe to do MRI with contrast to see AVM / aneurysm if i had at CT with contrast anaphylaxis shock ? Or how can do it otherwise ? Thank a lot.

Is it safe to do MRI with contrast to see AVM / aneurysm if i had at CT with contrast anaphylaxis shock ? Or how can do it otherwise ? Thank a lot.

Different: X-ray (CT) contrast is iodine based and allergic reactions are fairly common. MRI uses Gadolinium which is completely different and allergic reactions are rare. Here is a reference: http://www.medicalnewstoday.com/releases/92774.php I'm not aware of any cross-reactivity but the radiologist supervising your study will know for sure. Mention your previous reaction to them. ...Read more

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I have hypothyroidism. Is it safe to have a CT scan w/ contrast? If an MRI alternative? I also have a Harrington Rod in my back. Any alternative.

Thyroid and CT: If your hypothyroidism is appropriately treated there is nothing to worry about. If you do not have renal impairment, then the use of contrast should be safe. Every test, including a CT, is a balance of risks and benefits. If you need the CT, then go with your doctor's advice. ...Read more

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Which is safe and MRI or CT scan?

Which is safe and MRI or CT scan?

Both are safe.....: Mri has no ionizing radiation, thus there is no risk of radiation induced cancer. However, MRI is not for everyone. If you are claustrophobic, have a heart pacer, or have shrapnel you may not be able to have an mri. Ct does have radiation, but the dose is very small and in most cases less than you are exposed to just by living on earth for one year. You, your doc and radiologist should decide. ...Read more

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Can MRI without contrast diagnose stroke or is CT better?

Can MRI without contrast diagnose stroke or is CT better?

MRI: Both studies are commonly used in the early evaluation of stroke. A ct can rule out a hemorrhagic stroke quickly in the er. A MRI is more sensitive for a ischemic stroke but takes longer to perform. ...Read more

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What is the difference between MRI contrast and CT scan contrast ?

What is the difference between MRI contrast and CT scan contrast ?

Not same: Mri contast gadolinium does not contain iodine while ct contrast contains iodine. An allergic reaction to ct contrast does not mean that you will have a reaction to gadolinium during your MRI scan. True allergies to the MRI contrast are exrtremely rare; however, you may still experience some symptoms like feeling lightheaded or nauseated due to the injection. Good luck with the exam! ...Read more

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Can a CT and MRI without contrast detect a pituitary tumour?

Can a CT and MRI without contrast  detect a pituitary tumour?

Yes it could: Ct is more dependent on contrast. But MRI has two phases(t1and t2) which can serve like a contrast and the tumors often show up better in t2 weighted images. ...Read more

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Would you need an MRI with contrast or CT scan to diagnose chiasmal syndrome?

Either: Either a ct with and without contrast or an mr exam seem treasonable approaches. I may slightly favor the mr exam. ...Read more

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What would a CT head scan show versus having a MRI head scan? And with or without contrast?

Need to talk with : Your ordering doctor. Depends on what is being evaluated, and the differential diagnosis. Ct is a good quick screen for bleed, masses, skull fractures, etc. And MRI gets you good soft tissue details, and lets you better evaluate the gray and white matter, also allows you to evaluate bleeds, helps you tell if old or new bleed, also helps you see tumors, strokes (ischemic areas, atrophy, etc.). ...Read more

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I've gotten a few scans this year. 3 CT scans and 3 mri, one with contrast. Can I have cancer because of it?

I've gotten a few scans this year. 3 CT scans and 3 mri, one with contrast. Can I have cancer because of it?

Extremely unlikely: So unlikely that the likelihood approaches zero. You have more radiation exposure on a cross country flight, or hiking at altitude. That said, WHY did you have all those scans? If you have had unintentional weight loss, night sweats, or other unexplained pain, the scans may be looking for cancer. But the risk of cancer due to the scans is nearly zero. Why did you have them? ...Read more

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Bad idea to have contrast CT & contrast MRI in same day (i.e., too much, different contrast at once)? Should I request creatinine test 1st?

Bad idea to have contrast CT & contrast MRI in same day (i.e., too much, different contrast at once)? Should I request creatinine test 1st?

Radiologist: Your radiologist is likely to test you for creatinine, especially if there is any doubt about your renal function. Beyond that I would rely on the judgment of the radiologist. ...Read more

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Had MRI w/ no contrast yesterday and it showed 8mm hyporintense lesion in inferior aspect of spleen. Ct w/ contrast three days ago noted small granulomus are noted. Which is more reliable?Concerning?

Neither finding: Is cause for concern. Mri is better at finding small cysts and benign hemangiomas than ct. Granulomas are also benign and usually result from prior exposure to histoplasmosis (very common). ...Read more

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How dangerous is a head CT or MRI with contrast?

How dangerous is a head CT or MRI with contrast?

Both are very safe.: The ct uses a small amount of radiation and sometimes an injection into the veins is made to see the images differently. The MRI uses no radiation and it can also use an injection for better diagnosis, . ...Read more

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Had ct of head with and without contrast for HA. Results show small cyst and recommend MRI. Should I be concerned?

Had ct of head with and without contrast for HA. Results show small cyst and recommend MRI. Should I be concerned?

Not without symptoms: If you are not having symptoms, I don't think you even need an MRI. It's just wasting time & money going after an incidental finding. Most brain cysts are benign. If they were expanding, you would have neurologic symptoms (headache, vision probs). What prompted the MRI in the 1st place? Discuss with your primary doc or use HealthTap Prime to get advice from someone who knows your medical history. ...Read more

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I've had 3 CT scans with iodine contrast (my third one I had today) & multiple MRI's with contrast. Will this damage my kidneys?

I've had 3 CT scans with iodine contrast (my third one I had today) & multiple MRI's with contrast. Will this damage my kidneys?

Contrast OK but CT: exposure might be a little too much. Each time you get contrast, your kidneys will easily excrete it. As long as the doses are separated by a day or more, it won't hurt your kidneys. At only 19, you should talk to your doctor about ways to reduce the number of CTs to limit the ionizing radiation. MRIs and Ultrasounds have no ionizing radiation and are considered low risk for future cancer. ...Read more

Dr. Sheila Smith
5 doctors shared insights

Mri (Definition)

Mri or magnetic resonance imaging is one of the more recently developed imaging modalities available to physicians. It uses powerful magnets to generate images. There is no ionizing radiation which is a major advantage over many other modalities. Mri is the best imaging exam that we have for most soft tissue and joint related problems. There are radiologists ...Read more


Dr. Aletha Tippett
91 doctors shared insights

Porphyria (Definition)

Metabolic disorders caused by abnormalities in the synthesis of heme, the portion of hemoglobin which carries the iron inside red blood cells. Symptoms can range from light sensitivity to liver failure to nerve damage to bouts of terrible pain.Special testing is required to ...Read more