Central nervous system. Central nervous system Radiology college Guanghui Yu. DWI. A B. Normal tissue Brown's movement or diffusion Movement of hydrones at random. Cytotoxic edema
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Central nervous system
Brown's movementor diffusion
Movement of hydrones at random
Brown's movement of hydrones
Axial CT without and with intravenous injection of contrast medium. Nonenhancing, hypodense space-occupying lesion infiltrates part of the temporal lobe and insula on the right side. Two arrows indicate the compressed and displaced middle cerebral artery branches within the insular portion of the sylvian cistern
axial T2WI. Marked hyperintensity of the tumor due to the high water content of the neoplastic cells. coronal T1WI The tumor is markedly hypointense. Arrowheads point on the right side at the elevated sylvian fissure by the enlarged temporal lobe.
axial T2WI Left cerebellar hemispheric pilocytic astrocytoma, partially cystic.The nodular component is isointense. The tumor grows toward the cerebellopontine angle cistern. coronal T1WI. and with isointense nodular components. coronal T1WI following contrast injection. Enhancement of the nodular components
Infiltrating astrocytomas with ill-defined margin
hyperdense to the dura at an obtuse angle. Most lesions are homogeneously hyperdense, some isodense and a few hypodense
Marked homogeneous enhancement to the dura at an obtuse angle. Most lesions are homogeneously hyperdense, some isodense and a few hypodense
Axial T2 to the dura at an obtuse angle. Most lesions are homogeneously hyperdense, some isodense and a few hypodense WI. Frontoparietal extra-axial space-occupying lesion attached to the falx and the dura of the convexity, on the right side, reaching the midline. The paracentral lobule as well as the most cranial portion of the motor and sensory convolutions are compressed. No significant peritumoral oedema
Dural tail to the dura at an obtuse angle. Most lesions are homogeneously hyperdense, some isodense and a few hypodense
MR T1-weighted sagittal image, following intravenous injection of contrast. Marked homogeneous enhancement of the lesion.