MRA Head Without IV Contrast MRA of the head is a rapid, noninvasive tool, which is useful in the initial workup of late presenting stroke to evaluate for intracranial steno-occlusive disease when there is no indication for urgent EVT, although the clinical value of this information is controversial [22,23,69]. Cerebrovascular Diseases-Stroke MRA Neck Without and With IV Contrast MRA of the neck may be useful in screening for extracranial carotid disease. However, MRA of the neck tends to overestimate the degree of carotid stenosis in the absence of contrast administration [70] and is often limited in evaluation of vertebral origin disease due to respiratory motion artifacts [71]. MRA Neck Without IV Contrast MRA of the neck may be useful in screening for extracranial carotid disease. However, MRA of the neck tends to overestimate the degree of carotid stenosis in the absence of contrast administration [70] and is often limited in evaluation of vertebral origin disease due to respiratory motion artifacts [71]. MRI Head Perfusion With IV Contrast Contrast-enhanced MRI head perfusion imaging (or, if available, noncontrast ASL perfusion) may detect additional at-risk regions not demonstrated by DWI and aid in identifying the underlying etiology in some patients presenting with stroke beyond the 24-hour period. Specific instances arise in patients with complete extracranial internal carotid artery occlusion in whom MR perfusion can be used to determine its hemodynamic effect [31-33]. However, selection of patients with carotid occlusion for revascularization based on hemodynamic compromise does not improve outcome [18]. Perfusion imaging is not generally considered a first-line test in this clinical context [72,73]. MRI Head Without and With IV Contrast Rarely, brain tumors or other conditions can mimic ischemic stroke. MRI without and with IV contrast may be helpful in the secondary workup of patients presenting with stroke-like symptoms [62].
Cerebrovascular Diseases Stroke and Stroke Related Conditions PCAs. MRA Head Without IV Contrast MRA of the head is a rapid, noninvasive tool, which is useful in the initial workup of late presenting stroke to evaluate for intracranial steno-occlusive disease when there is no indication for urgent EVT, although the clinical value of this information is controversial [22,23,69]. Cerebrovascular Diseases-Stroke MRA Neck Without and With IV Contrast MRA of the neck may be useful in screening for extracranial carotid disease. However, MRA of the neck tends to overestimate the degree of carotid stenosis in the absence of contrast administration [70] and is often limited in evaluation of vertebral origin disease due to respiratory motion artifacts [71]. MRA Neck Without IV Contrast MRA of the neck may be useful in screening for extracranial carotid disease. However, MRA of the neck tends to overestimate the degree of carotid stenosis in the absence of contrast administration [70] and is often limited in evaluation of vertebral origin disease due to respiratory motion artifacts [71]. MRI Head Perfusion With IV Contrast Contrast-enhanced MRI head perfusion imaging (or, if available, noncontrast ASL perfusion) may detect additional at-risk regions not demonstrated by DWI and aid in identifying the underlying etiology in some patients presenting with stroke beyond the 24-hour period. Specific instances arise in patients with complete extracranial internal carotid artery occlusion in whom MR perfusion can be used to determine its hemodynamic effect [31-33]. However, selection of patients with carotid occlusion for revascularization based on hemodynamic compromise does not improve outcome [18]. Perfusion imaging is not generally considered a first-line test in this clinical context [72,73]. MRI Head Without and With IV Contrast Rarely, brain tumors or other conditions can mimic ischemic stroke. MRI without and with IV contrast may be helpful in the secondary workup of patients presenting with stroke-like symptoms [62].