Doctor insights on:
Subarachnoid Hemorrhage And Mri Scan
Magnetic resonance imaging named for the effects of the strong magnetic field upon the atomic and molecular phase or spin and the image created when that magnetic field is altered and the excited particle changes gibing off a signal that is recorded and interpreted by a complex computer algorithm, ...Read more
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
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
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
Would a regular MRI w/contrast on brain reveal severe vertebral artery insufficiency/stenosis causing vertigo?
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
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
Brain CT scan revealed intracranial hypertension. B12 deficiency highly likely will be established. Could CT scan be interpreted as brain shrinking?
No: The simple, brief answer is no, rather it is the opposite of shrinkage essentially. ...Read more
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
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
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
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 moreSee 1 more doctor answer
Left sided tingling numbness pain weakness. Subarachnoid hemorrhage in 2011 - right sided. MRI MRA clear. Difficulty breathing. Help?
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