noun
occlusion in the circle of Willis
Medical term for blockage of the cerebral arterial circle; also known as moyamoya disease (もやもや病).
See also: もやもや病
ウィリス動脈輪閉塞症は、もやもや病とも呼ばれる脳血管の病気です。
Occlusion in the circle of Willis is a cerebrovascular disease also called moyamoya disease.
Common Japanese name for the same condition; ウィリス動脈輪閉塞症 is the formal medical term.
Named after the circle of Willis (Willis動脈輪), the arterial structure at the base of the brain, combined with 閉塞症 (occlusion disease).