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Histopathology of the brain vascular network in moyamoya disease
Abstract:
There is an unusual vascular network at the base of the brain in patients with moyamoya disease. We detected various histologic lesions in the perforating arteries of 22 patients. Vessels showing rupture ranged from 50 to 530 microns in diameter; they were dilated, some had fibrin deposits in the wall, fragmented elastic laminae and attenuated media. Non-ruptured perforating arteries (diameter 200 to 550 microns) revealed microaneurysm formation, focal fibrin deposits and marked attenuation of the wall thickness with diminution of the elastic lamina. These changes seem to predispose to rupture of perforating arteries. Stenotic changes such as fibrous intimal thickening, collapse of the lumen and thrombosis were detected in 14 out of 22 cases. Morphometric analysis of perforating arteries indicated that arteries showing extreme degrees of stenosis or dilatation were more frequent in the patients with moyamoya disease than in the control cases. Dilative arteries were more frequent in the young patients and stenotic vessels were, in contrast, less frequent in the young patients.
Insights
Moyamoya disease involves abnormal brain blood vessels. Histologic analysis revealed ruptured and non-ruptured perforating arteries with wall damage, microaneurysms, and stenosis, increasing rupture risk.
Area of Science:
- Neurology
- Vascular Biology
- Cerebrovascular Diseases
Background:
- Moyamoya disease is characterized by a unique vascular network at the brain base.
- Perforating arteries are crucial for brain blood supply and are affected in moyamoya disease.
Purpose of the Study:
- To investigate the histologic characteristics of perforating arteries in patients with moyamoya disease.
- To identify specific vascular lesions that may predispose these arteries to rupture or stenosis.
Main Methods:
- Histologic examination of perforating arteries from 22 moyamoya disease patients.
- Morphometric analysis to compare vessel dimensions and lesion frequency with control cases.
Main Results:
- Observed diverse lesions in ruptured and non-ruptured perforating arteries, including dilation, fibrin deposits, fragmented elastic laminae, attenuated media, and microaneurysms.
- Stenotic changes like fibrous intimal thickening, lumen collapse, and thrombosis were present in 14 cases.
- Arteries with extreme stenosis or dilation were significantly more frequent in moyamoya patients compared to controls.
- Dilative changes were more common in younger patients, while stenotic changes were less frequent in this group.
Conclusions:
- The identified histologic changes in perforating arteries likely predispose them to rupture in moyamoya disease.
- Morphometric analysis confirms abnormal vessel morphology in moyamoya disease.
- Age appears to influence the type of vascular changes observed, with dilation more prevalent in younger patients.