"early DWI reversal (a.k.a. diffusion lesion reversal) can occur, most frequently with reperfusion, but this rarely alters the size of the eventual infarct and is probably a 'pseudoreversal' 3-5."
"Subacute (1-3 weeks) "
"Increased DWI signal in ischaemic brain tissue is usually observed within a few minutes after arterial occlusion and is primarily due to cytotoxic oedema resulting from a cascade that begins with depletion of ATP and failure of the sodium-potassium transmembrane pump. Imaging changes progress through a stereotypic sequence of DWI increase and ADC reduction due to initial intracellular shift of water (cytotoxic oedema), replenishment of depleted extracellular fluid (ionic oedema) and eventual apoptosis and/or liquefactive necrosis."
"Reported sensitivity ranges from 88-100% and specificity ranges from 86-100%. Only in a small minority of cases (~7%) imaging of patients with subsequently demonstrated ischaemic strokes is diffusion-weighted imaging negative 6. This occurs in one of three contexts 6:"
"Reported sensitivity ranges from 88-100% and specificity ranges from 86-100%. Only in a small minority of cases (~7%) imaging of patients with subsequently demonstrated ischaemic strokes is diffusion-weighted imaging negative 6. This occurs in one of three contexts 6:"
Expected headings
"Acute (0-7 days)"
"Subacute (1-3 weeks) "
"Chronic (>3 weeks)"