Elsevier

Surgical Neurology

Volume 55, Issue 1, January 2001, Pages 58-62
Surgical Neurology

Vascular
Spontaneous middle cerebral artery occlusion leading to moyamoya phenomenon and aneurysm formation on collateral arteries

https://doi.org/10.1016/S0090-3019(00)00339-6Get rights and content

Abstract

Background

Spontaneous middle cerebral artery occlusion associated with moyamoya phenomenon is distinct from moyamoya disease. The hemodynamic stress on the collateral channel occasionally leads to aneurysm formation, which may manifest as hemorrhage. The etiology of this disease has not been fully understood.

CASE DESCRIPTION

A 63-year-old woman presented with left putaminal hemorrhage. The cerebral angiogram revealed a significant stenosis in the proximal segment of the left middle cerebral artery. Collateral arteries originating from the horizontal segment of the ipsilateral anterior cerebral artery and the ambient segment of the ipsilateral posterior cerebral artery supplied the middle cerebral artery distal to the stenosis. Both of the collateral channels had associated aneurysms that were surgically obliterated. The aneurysm on the collateral artery from the posterior cerebral artery was responsible for the putaminal hemorrhage.

CONCLUSIONS

Spontaneous middle cerebral artery occlusion may lead to focal moyamoya phenomenon and aneurysmal intracerebral, intraventricular, or subarachnoid hemorrhage. The presence of a co-existing anomalous collateral artery in the present case suggests a congenital etiology of the focal middle cerebral artery occlusion.

Section snippets

Case report

A 63-year-old woman presented with a sudden onset of aphasia and right hemiparesis. Her blood pressure recordings revealed that she was normotensive (140/70 mmHg). Her computed tomography (CT) scan showed approximately 40 mL of left putaminal hematoma and a small amount of subarachnoid clot in the left Sylvian fissure (Figure 1). There was no intraventricular hemorrhage. Her left carotid angiogram demonstrated a severe focal stenosis in the proximal segment (M1) of the MCA. The circulation to

Discussion

In 1981 Fukawa et al described a clinical entity of spontaneous MCA occlusion associated with moyamoya phenomenon [1]. Patients with this disease usually present with either cerebral hemorrhage or ischemia in their 5th or 6th decade, but this disease can also be found in childhood [12]. This category of cerebrovascular occlusive disease is distinct from moyamoya disease as the carotid angiogram shows occlusion or stenosis restricted to the M1 segment of the MCA associated with localized

References (13)

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