Owing to the relatively rapid and noninvasive nature of the examination obviating the need for IV contrast, MRA may be preferable to CTA in patients with renal impairment, x-ray contrast allergy, or repeat presentations. Typically, noncontrast time-of-flight (TOF) MRA technique is sufficiently sensitive to screen for culprit intracranial lesions in the setting of suspected TIA [25]. MRA Neck Without and With IV Contrast MRA of the neck may be useful in screening for extracranial vascular disease in the initial workup and triage of patients presenting with TIA. Current AHA guidelines recommend noninvasive imaging of the cervical carotid arteries for patients with TIA or minor stroke who are candidates for CEA or stenting, within 48 hours of onset [12]. Noncontrast MRA of the neck tends to overestimate the degree of carotid stenosis when compared with contrast- enhanced MRA, particularly in cases of high-grade stenosis [26]. Typically, noncontrast TOF MRA technique is sufficiently sensitive to screen for culprit intracranial lesions in the setting of suspected TIA [27]. MRA Neck Without IV Contrast MRA of the neck may be useful in screening for extracranial vascular disease in the initial workup and triage of patients presenting with TIA. Current AHA guidelines recommend noninvasive imaging of the cervical carotid arteries for patients with TIA or minor stroke who are candidates for CEA or stenting, within 48 hours of onset [12]. Noncontrast MRA of the neck tends to overestimate the degree of carotid stenosis when compared with contrast- enhanced MRA, particularly in cases of high-grade stenosis [26]. Typically, noncontrast TOF MRA technique is sufficiently sensitive to screen for culprit intracranial lesions in the setting of suspected TIA [27].
Cerebrovascular Diseases Stroke and Stroke Related Conditions PCAs. Owing to the relatively rapid and noninvasive nature of the examination obviating the need for IV contrast, MRA may be preferable to CTA in patients with renal impairment, x-ray contrast allergy, or repeat presentations. Typically, noncontrast time-of-flight (TOF) MRA technique is sufficiently sensitive to screen for culprit intracranial lesions in the setting of suspected TIA [25]. MRA Neck Without and With IV Contrast MRA of the neck may be useful in screening for extracranial vascular disease in the initial workup and triage of patients presenting with TIA. Current AHA guidelines recommend noninvasive imaging of the cervical carotid arteries for patients with TIA or minor stroke who are candidates for CEA or stenting, within 48 hours of onset [12]. Noncontrast MRA of the neck tends to overestimate the degree of carotid stenosis when compared with contrast- enhanced MRA, particularly in cases of high-grade stenosis [26]. Typically, noncontrast TOF MRA technique is sufficiently sensitive to screen for culprit intracranial lesions in the setting of suspected TIA [27]. MRA Neck Without IV Contrast MRA of the neck may be useful in screening for extracranial vascular disease in the initial workup and triage of patients presenting with TIA. Current AHA guidelines recommend noninvasive imaging of the cervical carotid arteries for patients with TIA or minor stroke who are candidates for CEA or stenting, within 48 hours of onset [12]. Noncontrast MRA of the neck tends to overestimate the degree of carotid stenosis when compared with contrast- enhanced MRA, particularly in cases of high-grade stenosis [26]. Typically, noncontrast TOF MRA technique is sufficiently sensitive to screen for culprit intracranial lesions in the setting of suspected TIA [27].