What's the likelihood of a CT scan missing a brain tumor?

CT not sensitive. Ct brain is a fast screening exam that is often used in the acute setting such as the emergency room. It is helpful in detecting obvious tumor and mass effect from the tumor. However, it is not sensitive in the detection of small tumor which does not produce mass effect or surrounding brain edema. Mri brain with and without contrast is the best imaging modality for detecting brain tumor.
Depends. If done without contrast, it could be missed. If the tumor is in the posterior fossa (back of brain or brainstem) could be missed. With a ct scan, the bones in the back of the head commonly cause artifact and a mass could be missed. If there is a concern, then a MRI with gadolinium should be performed. But a ct scan with contrast is a good study. Hope this helps.

Related Questions

Could CT scan cause a brain tumor?

Rare. Many ct scans of the head can theoretically cause brain cancer several years later. See radiology physicist at your hospital to calculate your dose and risk if you had many head ct scans. Read more...

Non contrast CT scan show growing brain tumor, what is wrong?

Need more evaluation. It is very difficult to diagnose a brain tumor on a non-contrast ct scan. I would recommend getting a brain MRI with contrast (called gadolinium). Mri takes a much better look at the brain than does ct. Read more...
Brain Tumor. If you have a brain tumor showing up on a ct scan, that is clearly what is "wrong", and you need to talk to your doctors as to how to further have it evaluated and how to best treat it. You should under no circumstances ignore it. Read more...

Can anyone of you drs give me a website link of a CT scan with contrast showing a brain tumor?

Johns Hopkins site. http://www.hopkinsmedicine.org/neurology_neurosurgery/specialty_areas/brain_tumor/diagnosis/how-to-diagnose-brain-tumors.html and here's a nice scan of a tumor as well. Read more...

If CT scan w&wo contrast came back normal with no brain tumor found 2 years and 7 months ago what's my risk to have one now if I have new symptoms?

It depends. It all depends on what kind of tumor was identified over two yrs ago. New symptoms strongly suggest that you need new studies. You should consult your neurologist or primary care m d. An MRI is more sensitive for soft tissue problems then a ct. Read more...
It depends,,, It depends on what kind of symptoms you have and likely if you're worried about a certain kind of tumor. Brain tumors may not have any symptoms, but if they do, anything from a headache to a focal neurological deficit, like a problem with gait (walking), can mean brain tumor. Vision changes can also occur. If you have these or some other symptoms it'd be wise to see your doctor for follow-up. Read more...

Last question I promise 2 years and 7 month ago I got a CT scan with and without contrast and it was clear? D I need to still worry about brain tumor

Brain tumor? I assume u had brain scan. Any symptoms?. Most likely nothing to worry about if negative scan & no symptoms. Read more...
Most. 23 year old men do not need a head ct +/- contrast in the first place, and the exposure from the radiation when you do not need a scan is not worth repeating. Imaging is expensive and should only be done when necessary. You provide no information suggesting either ct or MRI is indicated. Read more...