Summary
The morphogenesis of the vascular lesions, which were considered to be the immediate cause of hypertensive intracerebral hemorrhage, was morphologically studied in autopsy cases. The direct cause of the hemorrhage was the rupture of the intracerebral microaneuysms resulted from the plasmatic arterionecrosis. The arterionecrosis was predominantly present in the intracerebral arteries of approximately 150 µ diameter, especially in the external branches of the arteriae corporis striati mediae in the putamen, and characterized by medial smooth muscle cell loss, blood plasma insudation in the intima, histolysis of the internal elastic lamina and intimal collagenous fibers, fibrin deposition (fibrinoid degeneration) in the intima, and luminal dilatation. The morphogenesis of the arterionecrosis was the development of histolysis as well as fibrinoid degeneration caused by blood plasma insudation in the wall of the intracerebral arteries with preceding necrosis and loss of medial smooth muscle cells and subsequent fibrous intimal thickening with dilated lumina. Intracerebral microaneurysms were also formed by the plasmatic arterionecrosis in a narrow sense, in which histolysis due to blood plasma insudation had occurred, but fibrin (fibrinoid substance) deposition in the intima had not yet arisen.
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Ooneda, G., Yoshida, Y., Suzuki, K. et al. Morphogenesis of plasmatic arterionecrosis as the cause of hypertensive intracerebral hemorrhage. Virchows Arch. Abt. A Path. Anat. 361, 31–38 (1973). https://doi.org/10.1007/BF00543548
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DOI: https://doi.org/10.1007/BF00543548