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Vessel Wall MRI Enhancement in Noninflammatory Cerebral Amyloid Angiopathy
Q Hao1, N M Tsankova2, H Shoirah3
1From the Departments of Neurology (Q.H.).
Abstract:
Cerebral amyloid angiopathy is characterized by deposition of amyloid-β fibrils in the walls of small-to-medium-sized blood vessels. In this retrospective review of 5 patients with histologically confirmed noninflammatory cerebral amyloid angiopathy, high-resolution vessel wall MRI showed arterial wall enhancement in 2 patients (40%). Despite common consensus of equating vessel wall enhancement with inflammation, this report demonstrates that β-amyloid accumulation alone without inflammation can be associated with arterial wall enhancement in a subset of patients.
Insights
Cerebral amyloid angiopathy (CAA) can cause arterial wall enhancement on MRI, even without inflammation. This finding challenges the assumption that vessel wall enhancement always indicates inflammation in CAA patients.
Area of Science:
- Neuroradiology
- Neuropathology
- Cerebrovascular Diseases
Background:
- Cerebral amyloid angiopathy (CAA) involves amyloid-β deposition in cerebral blood vessels.
- Vessel wall enhancement on MRI is often attributed to inflammation.
Observation:
- This study reviewed 5 patients with confirmed noninflammatory CAA.
- High-resolution vessel wall MRI was performed.
Findings:
- Arterial wall enhancement was observed in 2 of 5 patients (40%).
- This enhancement occurred in the absence of inflammation, linked solely to amyloid-β accumulation.
Implications:
- Vessel wall enhancement in CAA does not exclusively signify inflammation.
- Amyloid deposition alone can cause detectable arterial wall changes on MRI.
- This finding may refine diagnostic criteria and understanding of CAA pathogenesis.
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