Introduction:
High-resolution vessel wall imaging (HR-VWI) of the intracranial vasculature may aid in the diagnosis and management of Moyamoya Disease (MMD). The patterns of HR-VWI findings of the cerebral vasculature of MMD patients remains uncertain, however. We sought to describe HR-VWI findings in a single-center cohort of MMD patients.
Methods:
Consecutive patients who were evaluated at a Midwest American medical center with a HR-VWI exam were included. Fourteen anterior circulation arterial segments in each patient were analyzed: proximal and distal supraclinoid Internal Carotid Artery, proximal M1 segment of the Middle Cerebral Artery, mid-portion of the M1, distal M1, proximal A1 segment of the Anterior Cerebral Artery and distal A1. Imaging variables that were collected from each segment included the presence of wall thickening (concentric vs eccentric), degree and pattern (concentric or eccentric) of contrast enhancement, and presence of positive or negative vessel remodeling. The total number and percentage of vessel segments demonstrating these characteristics were calculated. The number and percentage of patients with at least one segment demonstrating these characteristics were calculated.
Results:
Thirty-six patients (32 females, 88.9%) with a diagnosis of MMD were included. Overall, 221 of 504 segments (43.8%) demonstrated negative remodeling in 29 (75%) patients. Ninety-eight segments (19.4%) demonstrated wall enhancement (71 concentric, 27 eccentric; 22 high grade, 76 low grade) in 32 (88.9%) patients. Eighty-seven segments (17.3%) demonstrated wall thickening (52 concentric, 35 eccentric) in 32 patients (88.9%).
Conclusions:
Negative remodeling was the most-commonly observed vessel wall abnormality in all segments analyzed. However, a high percentage of patients had at least one segment demonstrating wall enhancement, wall thickening and negative remodeling. Continued study is necessary to further elucidate the HR-VWI patterns of the cerebral arterial system in MMD patients.