Intracranial hemorrhage MRI: Difference between revisions
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==MRI== | ==MRI== | ||
===Subarachnoid Hemorrhage === | ===Subarachnoid Hemorrhage === | ||
*Fluid-attenuated inversion recovery (FLAIR) is the most sensitive MRI pulse sequence for the detection of SAH. | *Fluid-attenuated inversion recovery (FLAIR) is the most sensitive MRI pulse sequence for the detection of SAH. SAH appears as high-intensity signal in normally low signal CSF spaces. | ||
*T2- and T2*-weighted images can potentially demonstrate SAH as low signal intensity in normally high-signal subarachnoid spaces. | *T2- and T2*-weighted images can potentially demonstrate SAH as low signal intensity in normally high-signal subarachnoid spaces. | ||
*On T1-weighted images, acute SAH may appear as intermediate- or high-intensity signal in the subarachnoid space. | *On T1-weighted images, acute SAH may appear as intermediate- or high-intensity signal in the subarachnoid space. | ||
*MR angiography may be useful in the evaluation of aneurysms and other vascular lesions that cause SAH. | *MR angiography may be useful in the evaluation of aneurysms and other vascular lesions that cause SAH. | ||
===Subdural Hemorrhage=== | ===Subdural Hemorrhage=== | ||
*MRI is more sensitive than CT scanning in the detection of subdural hematomas because the multiplanar and superior tissue differentiation of MRI makes detection easier. | *MRI is more sensitive than CT scanning in the detection of subdural hematomas because the multiplanar and superior tissue differentiation of MRI makes detection easier. | ||
Latest revision as of 18:43, 13 March 2013
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Intracranial hemorrhage Microchapters |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
MRI
Subarachnoid Hemorrhage
- Fluid-attenuated inversion recovery (FLAIR) is the most sensitive MRI pulse sequence for the detection of SAH. SAH appears as high-intensity signal in normally low signal CSF spaces.
- T2- and T2*-weighted images can potentially demonstrate SAH as low signal intensity in normally high-signal subarachnoid spaces.
- On T1-weighted images, acute SAH may appear as intermediate- or high-intensity signal in the subarachnoid space.
- MR angiography may be useful in the evaluation of aneurysms and other vascular lesions that cause SAH.
Subdural Hemorrhage
- MRI is more sensitive than CT scanning in the detection of subdural hematomas because the multiplanar and superior tissue differentiation of MRI makes detection easier.
- The shape of the subdural hematoma on axial images is the same crescent-shaped pattern seen on CT scan images.
- The signal depends on the age of the hemorrhage and follows the signal pattern of intraparenchymal hematomas in acute and subacute cases.
- Chronic subdural hematomas, which appear as isoattenuation relative to CSF on CT scans, often demonstrate increased signal intensity on T1-weighted images because of the presence of free methemoglobin, though the intensity decreases over time.