Abstract
Background:Whether unilateral moyamoya disease (MMD), confirmed by steno-occlusive lesion at the terminal portion of internal carotid artery with formation of moyamoya vessels unilaterally and normal or equivocal findings contralaterally, is an early form of definite (bilateral) MMD remains controversial. It is well-known that adult patients with MMD tend to suffer from cerebral hemorrhage, occasionally due to the rupture of aneurysm arising from moyamoya vessel.Case Description:A 61-year-old woman was diagnosed as unilateral MMD incidentally and followed by magnetic resonance imaging annually. Seven years after the diagnosis, cerebral aneurysm appeared on the moyamoya vessel. Before further examination, the aneurysm ruptured and resulted in massive cerebral hemorrhage.Conclusion:Even in the unilateral MMD, cerebral hemorrhage may occur due to the rupture of cerebral aneurysm. Careful follow-up is recommended and early treatment is required once cerebral aneurysm is detected.
Highlights
Moyamoya disease (MMD) is characterized by progressive occlusion of the internal carotid artery (ICA) or its terminal branches, associated with formation of extensive collateral vessels at the base of the brain
It is reported that cerebral aneurysm arising from moyamoya vessels can be a cause of hemorrhage.[6]
We have reported clinical feature of nine cases of unilateral MMD[3] and one of the patients deteriorated because of rupture of cerebral
Summary
Even in the unilateral MMD, cerebral hemorrhage may occur due to the rupture of cerebral aneurysm. Careful follow‐up is recommended and early treatment is required once cerebral aneurysm is detected. Quick Response Code: Key Words: Cerebral aneurysm, Intracerebral hemorrhage, moyamoya disease, Unilateral
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