MRI Imaging for Possible TIA 14 Days After Event

Key Imaging Recommendations

• The American College of Radiology recommends MRI brain without contrast to identify any acute or subacute ischemic lesions that may have resulted from the TIA event, even at 14 days post-event 1, 3, 5
• The American College of Radiology explicitly states there is no relevant literature supporting the use of contrast-enhanced MRA of the head in TIA evaluation 1, 2, 3, 4

Complete Neurovascular Workup Beyond Brain MRI

• Incomplete neurovascular imaging is associated with increased odds of stroke, therefore MRA head without contrast or carotid duplex ultrasound should be obtained to screen for extracranial carotid stenosis 1, 3, 6, 5
• The American Heart Association guidelines recommend vascular studies to be performed within 48 hours of symptom onset, but remain important even at 14 days 1, 3, 6, 5

Clinical Context and Timing Considerations

• The 90-day stroke risk after TIA ranges from 11.6% overall to 20.1% for carotid territory TIAs 5

Recommended Imaging Protocol

• The American College of Radiology recommends ordering MRI brain without contrast, MRA head without contrast, and MRA neck without contrast or carotid duplex ultrasound 1, 3, 5, 6
• The American College of Radiology recommends against ordering MRI brain with contrast, MRI brain with AND without contrast, and MRA with contrast enhancement 1, 2, 3, 4