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Doctor insights on: Subarachnoid Hemorrhage And Mri Scan

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Can CT scan without contrast show brain aneurysm?

Can CT scan without contrast show brain aneurysm?

Unlikely: Ct scan without contrast is unlikely to show an aneurysm unless it is very large and is calcified. A ct angiogram is a better study to visualize an aneurysm. ...Read more

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Dr. Lawrence Kessler
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


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Can a CT scan of the head without contrast dye detect brain aneurysms?

Can a CT scan of the head without contrast dye detect brain aneurysms?

Yes: While plain ct scan is not the best test for aneurysm, large aneurysms can potentially be spotted. Mri is a better test, especially when blood vessels are looked at as well. ...Read more

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Can a CT scan detect brain aneurysms?

Can a CT scan detect brain aneurysms?

CT angiogram: A regular ct scan might detect a large aneurysm with calcium. A test that is designed specifically to look for aneurysms is the ct angiogram. With this test contrast goes into the vessels of the brain. If there is an aneurysm that is larger than 2 mm, it should be detected with this technique. ...Read more

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Does a CT scan without dye detect an unruptured brain anuerysm?

Does a CT scan without dye detect an unruptured brain anuerysm?

Not likely: Most intracranial vascular anomalies, including aneurysms, require IV contrast to be seen on ct head. However, ct without contrast is 90% sensitive for intracranial bleeding. The risks of IV contrast for ct include kidney injury and allergy to contrast dye. Good luck! ...Read more

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Could a mri/ct scan detect all brain injurys?

Could a mri/ct scan detect all brain injurys?

Nope: Sometimes you can see evedence of bleeding. With traumatic brain injury sufficient to cause changes on ct typically survival is markedly reduced. Certain types of MRI done at the right time following a brain injury can sometimes show evidence of cerebral contusion. Much of the damage done with traumatic brain injury is microscopic (too small even with diffuse axonal injury) to be seen on mri. ...Read more

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Could MRI or CT scan detect brain cancer?

Could MRI or CT scan detect brain cancer?

Sure: Mri would be the imaging test of choice, though often we start with a ct. Ultimately, you'll likely need a biopsy to prove it's a cancer. ...Read more

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Would a regular MRI w/contrast on brain reveal severe vertebral artery insufficiency/stenosis causing vertigo?

Would a regular MRI w/contrast on brain reveal severe vertebral artery insufficiency/stenosis causing vertigo?

Probably not,: you would need an MRI specifically tailored for that purpose, called an MRA(magnetic resonance angiography). There is a chance a standard MRI could pick up a vertebral artery stenosis, but not likely. ...Read more

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Can a brain aneurysm show on MRI with contrast?

Can a brain aneurysm show on MRI with contrast?

Only if large enough: MRI with contrast has a resolution limit of about 5 mm, depending on the field strength of the magnet & the spin sequence performed (resolution of time-of-flight MRI or TOF-MRI is even worse). The "gold standard" for an aneurysm is a fluoroscopic angiogram of the brain, which only interventional neurologists or radiologists perform 4 (1) known stroke or (2) genetics. Use HealthTap Prime to discuss ...Read more

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Can MRI with contrast miss brain tumor?

Can MRI with contrast miss brain tumor?

Best test: An MRI with contrast is the best test to detect a brain tumor. If the MRI did not detect a brain tumor then it is likely either too small to see or there is no brain tumor. ...Read more

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Would a plain CT scan show an unruptured aneurysm in the brain ?

Would a plain CT scan show an unruptured aneurysm in the brain ?

Need contrast: Very difficult to see aneurysms in the brain without contrast. If you are concerned about this as a possibility you should ask your doctor about your risk. ...Read more

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Can a CT scan without contrast dye detect brain tumours?

Can a CT scan without contrast dye detect brain tumours?

Should do it: If a brain tumor is causing significant symptoms, it should surely be large enough to be detected on a cat scan. ...Read more

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Echocardiogram results indicate an avm. Ct scan of chest and MRI & mra of brain are still negative. Where else might the avm be?

Echocardiogram results indicate an avm. Ct scan of chest and MRI & mra of brain are still negative. Where else might the avm be?

Anywhere: Arteriovenous malformation or avm is an abnormal connection between arteries and veins, bypassing the capillary system. The congenital vascular anomaly occurs commonly in the central nervous system, but can appear in any location. Although many avms are asymptomatic, they can cause intense pain or bleeding or lead to other serious medical problems. ...Read more

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Can previous strokes be seen on CT or MRI of brain?

Can previous strokes be seen on CT or MRI of brain?

Yes, MRI: can visualize almost all prior strokes. CT is somewhat less sensitive, and will be able to pick up most of the larger old strokes, but may not pick up very small old strokes. ...Read more

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Can head CT w&wo contrast cause brain tumors?

Can head CT w&wo contrast cause brain tumors?

Very little chance: Because our understanding of radiation induced cancer is incomplete, it is assumed that any exposure to radiation increases the risk of developing cancer. This is called the non-threshold model. According to a recent nejm article the risk is approximately 0.005% at age 35 that a single ct brain would cause death due to cancer. N engl j med 2007; 357:2277-2284. The risk is even smaller at > age. ...Read more

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Is orbital CT scan and CT scan sinus the same?

Not quite: The CT of the sinuses focuses in on the sinuses (though the radiation goes through the entire skull) and generally covers the entire set of sinuses (sphenoid, maxillary, frontal, ethmoid). The orbital CT will cover the eye sockets (and those pictures are zoomed in). While the sinuses lies behind the eyes (& so they overlap), the focus & coverage of these scans are slightly different. ...Read more

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Can CT scan without contrast show any brain tumors?

Sometimes: Brain swelling, hemorrhage and mass effect can be noted on a head ct without contrast. Also, some tumors have calcification a which can be seen in a head ct. Smaller and lower grade tumors can sometimes be missed on a head ct without contrast. ...Read more

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Dr. Jonathan Dissin
546 doctors shared insights

Subarachnoid Hemorrhage (Definition)

A condition in which there is bleeding into the space between the two thin coverings immediately surrounding the brain. It can be caused by a bleeding disorder or a head injury. It begins suddenly as a severe headache before other symptoms such as drowsiness ...Read more


Dr. Bryan Treacy
779 doctors shared insights

Heavy Bleeding (Definition)

Usually described by physicians as having to change a pad more than every 1-2 hours, passing large clots, change from your previous pattern, needing overnight protection, ...Read more