33. Stadia (requisites) Phase Time Hemoglobin, Location Appearance T1-Weighted MRI T2-Weighted MRI Hyperacute < 6 h Central oxyhemoglobin, peripheral deoxyhemoglobin Mild hyperintense High with peripheral low Acute <6 to 72 h Deoxyhemoglobin, intracellular Iso to low intensity Low Early subacute >3 d Methemoglobin, intracellular High Low Late subacute >7 d Methemoglobin, extracellular High High Chronic >14 d Ferritin and hemosiderin, extracellular Low Low
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Editor's Notes
Anterior Choroideal artery (AchA in blue)) The territory of the AChA is part of the hippocampus, the posterior limb of the internal capsule and extends upwards to an area lateral to the posterior part of the cella media. Originates from the internal carotid artery , though it also rarely arises from the middle cerebral artery .
ilocytic astrocytoma. Sagittal postcontrast T1W MR image demonstrates the classic “cyst and nodule” appearance of a pilocytic astrocytoma in the posterior fossa. Thin rim enhancement is seen involving the cyst wall.
Toxo
Oxyhem is diamagnetische Deoxy is para
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Figure 3: Axial post-contrast T1WI shows ring enhancement of the right subdural fluid collection (arrow) with associated meningeal enhancement. Figure 4: Axial diffusion weighted images shows increased signal of the right subdural fluid collection (arrow) with low apparent diffusion coefficient.