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Doctor insights on: Would A Ct Scan Of The Head Still Be Valid After Seven Months

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Dr. Marvin Ott
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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 possible to look for a swollen lymph node for biopsy without having another CT scan? I already had two abd/pelv CT scans in the past 3 months.

Is it possible to look for a swollen lymph node for biopsy without having another CT scan? I already had two abd/pelv CT scans in the past 3 months.

Why do you ask?: If you have no palpable lymph node for biopsy, and none's known, why get the biopsy? The one disease for which a node might be sought for the purpose is sarcoidosis, but if it's worth treating -- and commonly it isn't -- you'll have a mass or symptoms that will show what should be biopsied. Perhaps there's another way of answering your personal health questions, or even a misunderstanding. ...Read more

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I had 2 CT scans within a month after two hard hits to the head. Is this dangerous in terms of radiation? Never had one before.

I had 2 CT scans within a month after two hard hits to the head. Is this dangerous in terms of radiation? Never had one before.

Radiation exposure: Yes, you were exposed to radiation, but I am sure that your doc considered the tests necessary and the overall exposure is low. ...Read more

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Is there a warranty period for a MRI of the head? Had a normal scan couple of years ago for vertigo related symptoms. Another scan recommended?

Is there a warranty period for a MRI of the head?  Had a normal scan couple of years ago for vertigo related symptoms.  Another scan recommended?

Snap shot : ?Warranty period ? You're kidding right. The MRI is a snapshot of what was happening on the day you had it done.You can have numerous things happen in your life over a couple of years that would change it. A tumor could arise from nothing to the size of a grapefruit in a few months, much less two years. Hope you don't have something bad but get real. ...Read more

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Ct scans good for catching brain tumors? I did a CT scan several months ago because i was having head and neck pain. The CT scan turned out to be normal, but the head and neck pain have returned. I was wondering what the odds are that the CT scan missed

Ct scans good for catching brain tumors? I did a CT scan several months ago because i was having head and neck pain.  The CT scan turned out to be normal, but the head and neck pain have returned.  I was wondering what the odds are that the CT scan missed

They aregood: Mri are better more sensitive as are ct with contrast or pet enhanced plain ct 83% sensitive congrats on normal ct . This should reassure you along with symptoms which come and go symptoms that go most neck pain is muscular and stress related with associated headaches common tension symptoms brain tumor is far down on the list when you hear hoof beats they are probably not zebras. ...Read more

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Why would a CT scan obtained the 3rd day after a lacunar stroke be normal?

It is possible: Sometimes a lacunar stroke does not appear on CT - at least for a small lacunar stroke. An MRI of the brain would be a more useful tool to determine if a stroke has occurred. A CT scan is less costly, and should always be done to evaluate stroke (for bleeding) but it may not see small changes, sometimes even 3 days later. ...Read more

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I recently had a Head and Neck CT scan. One without and one with contrast. What are the chances a brain tumor causing symptoms was missed?

I recently had a Head and Neck CT scan. One without and one with contrast. What are the chances a brain tumor causing symptoms was missed?

Very remote: CT scan will pick up a brain tumor easily although it is not the best test for small(tiny) tumors. But then you would not have any symptoms from a small lesion. Please share information about your symptoms with us....we like to have detailed history of what is bothering you to start with. ...Read more

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How long do the negative results of a head scan remain relevant if, a month after the scan, the same headaches that prompted the scan have returned?

How long do the negative results of a head scan remain relevant if, a month after the scan, the same headaches that prompted the scan have returned?

CT rarely useful: While ct of the head is almost always ordered by an er doctor when a person goes to the er with new severe headache, a repeat ct after a negative study (assuming it was done with contrast) is rarely useful in the diagnosis of headache. A clever and thorough neurologist or migraine center is the most likely approach to take at this point. ...Read more

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If I conceived a week after a head ct scan will this affect the fetus?

No: The x-Ray radiation from the CT scan is an instantaneous process, once the radiation has passed through your body, none remains in side of you. The X-Rays can do some DNA damage when passing through you, and could potentially damage a growing fetus if they were directly scanned. If you had only a head CT and not abdomen the exposure of the egg that was fertilized would likely be negligible as well ...Read more

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I had a CT scan 10 years ago due to headaches. It came back abnormal. It said a focal, well circumscribed area of low density is identified within the region of corpus. I did an MRI after that and the results were normal. Should I be worried?

I had a CT scan 10 years ago due to headaches. It came back abnormal. It said a focal, well circumscribed area of low density is identified within the region of corpus. I did an MRI after that and the results were normal. Should I be worried?

MRI more sensitive.: The results of a brain MRI are more conclusive than the results of a CT scan, so if the MRI reading was correct, then you would have little to worry about. However, if happen to have copies of the studies on a CD, you can request a secondary review by initiating a private consult here on HealthTap. ...Read more

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Is it possible for a one year old to vomit several times after hitting her head and not have a brain injury/skull fracture/concussion? No CT scan

Is it possible for a one year old to vomit several times after hitting her head and not have a brain injury/skull fracture/concussion? No CT scan

Closed head injury: Vomiting tends to be more common in children following a head injury compared to adults. Depending on the severity of head injury the frequency of vomiting varies. Most head injuries from "hitting a head" do not lead to skull fracture or bleeding inside the head. CT is often not necessary. if the child vomits more than 3 times and/or there are other symptoms or signs then an evaluation is needed ...Read more

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I had a right hemicollectomy two yrs ago and aim havin a CT scan sonn is there a blood test that I should be having that would detect any more cancer ?

I had a right hemicollectomy two yrs ago and aim havin a CT scan sonn is there a blood test that I should be having that would detect any more cancer ?

You need follow up: Prognosis for localized colon cancer after colectomy is excellent , but need close follow up , regular examinations , need repeat colonoscopy, and scans as you mentioned. Several tumor markers available by blood test , non specific but one very frequently used is cea levels for tumor recurrence , please follow you doctors advise with follow up visits. ...Read more

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I've had at least one CT scan (possibly 2...Would they have done one after my craniotomy from a hematoma?). Am i at a higher risk of brain cancer?

I've had at least one CT scan (possibly 2...Would they have done one after my craniotomy from a hematoma?). Am i at a higher risk of brain cancer?

Doubt it: There's some studies suggesting that children who have a bunch of of ct scans over long illnesses are at some extra risk for leukemia and perhaps brain tumors; this makes sense biologically but the risk isn't huge. I wouldn't waste energy worrying about just one or two; i'd be glad instead that the hemotoma's out and i hope you'll do well from this. ...Read more

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Had a CT scan of my head about three months ago getting another for head aches and confusion .Is that many CT scans safe? Can anxiety cause that?

Talk to your doctor: If you have persistent headaches, you may want to ask your doctor whether they would consider a mri/mra instead of a ct scan. Mri does not use x-rays (unlike ct), and has much greater diagnostic value that ct in the brain, and allowis to study blood vessels without dye with mra. At your age, the likelihood of finding a serious problem is not very high; therefore stress and anxiety may be present. ...Read more

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Had a CT angiography done on the first and still no word of my results should I be worried?

Worried about what?: This is a subspecialty examination and it could be that the person who does such work was not available at the imaging site. If you haven't heard byt today though, i would suggest calling the radiology facility to get a copy of your report sent to your doctor. You should discuss your report with the doctor rather than interpreting it yourself. ...Read more

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After head injury, if CT within 48 hours is normal, is it possible for a chronic subdural hematoma to develop later despite the normal initial CT scan?

After head injury, if CT within 48 hours is normal, is it possible for a chronic subdural hematoma to develop later despite the normal initial CT scan?

Yes but: It is not likely to be subdural hematoma but the more worrisome would be epidural and if symptoms persist you should see your doctor. Concussion can present very similarly and MRI is best for evaluating these symptoms. However, don't det ...Read more

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Will a MRI or CT scan of the brain so symptoms of a stroke days after a stroke? Think I may have had one I'm not sure.

Will a MRI or CT scan of the brain so symptoms of a stroke days after a stroke? Think I may have had one I'm not sure.

Yes: Both scans can show signs of strokes as they evolve over time however the key for you is to be evaluated by your personal or an ER physician. Additionally, small strokes that have symptoms completely resolve called TIA's may not show on imagining but are still very important to be evaluated. ...Read more

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Will a cat scan of my head rule out MS or a brain tumor better than mri? Had one before but am having another one due to vertigo.Im 18.Am i in danger?

Will a cat scan of my head rule out MS or a brain tumor better than mri? Had one before but am having another one due to vertigo.Im 18.Am i in danger?

No: Mri is by far the test of choice for ms. Either way will detect brain tumors, but actual better picture of the tumor itself with a mri. There is no danger to mri. Cat scans have radiation, but your doctor will guide you in consultation with a radiologist as to which test is most appropriate for your symptoms. ...Read more

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Is a chronic subdural hematoma detected by CT scan important or just a normal occurance in a 83 year old that hit head 3 days prior to scan?

Is a chronic subdural hematoma detected by CT scan important or just a normal occurance in a 83 year old that hit head 3 days prior to scan?

Chronic > 3 days: "Chronic" means that the bleeding began a few wks after injury. Thus, it is less likely that the hit to the head 3 days prior to the head CT caused the "chronic" subdural hematoma (SDH). SDH and head trauma are risk factors for seizures and other conditions. The patient should be closely monitored and see a neurologist for evaluation. http://www.nlm.nih.gov/medlineplus/ency/article/000781.htm ...Read more

Dr. Michael Gabor
1,841 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