The most striking MRI findings in MLIV include a dysplastic corpus callosum, widespread white matter abnormalities, including abnormal diffusion weighed imaging values: increased mean diffusivity and decreased fractional anisotropy, decreased T2 signal intensities in the thalamus due to increased ferritin deposition, and cerebellar atrophy in older patients [ 6– 8].
Optic nerves of eyes with remote optic neuritis history had abnormal diffusion tensor imaging, either increased radial diffusivity or decreased fractional anisotropy, which was associated with greater degrees of RNFL thinning by OCT and worse visual function (Naismith et al., 2010; Smith et al., 2011).
Endothelial dysfunction and increased vasopermeability have been considered the pathophysiological mechanisms for abnormal diffusion of gadolinium from the vascular compartment to the interstitial space.
Since MR diffusion-weighted (DW) imaging is widely considered the most sensitive and specific technique to examine the ischemic core, new knowledge about CT perfusion findings in areas of abnormal diffusion would likely provide valuable information.
All patients had an abnormal diffusion capacity with normal transfer coefficients for carbon monoxide 12-20 months after hospital discharge.
Consistent with our primary hypothesis, abnormal diffusion properties were present in the Anterior Limb of the Internal Capsule (ALIC).
The underlying concept of DPM is that the abnormal diffusion areas represent the ischemic core, which will progress to infarction independent of treatments.
Specifically, DTI measures the water diffusion situation in neural fibre so that it is frequently used to investigate the abnormal diffusion in the brain.
CE breast MRI has attractions for this purpose, since it has high sensitivity for invasive tumour and is dependent on increase in vessel density and abnormal diffusion properties of tumour blood vessels for its mode of visualisation.
Moreover there seems to be a link between the abnormal microstructural properties in white-matter regions and the cognitive impairments seen in breast cancer patients treated with chemotherapeutic agents; several studies observed correlations between abnormal diffusion properties and cognitive problems on neuropsychological testing [53].
As a result, brain regions with abnormal perfusion that reside outside of the abnormal diffusion areas, known as DPM, may be indicative of viable tissues, but they are at an increased risk of irreversible injury in the absence of timely reperfusion [ 19, 20].
