Aneurysmal dilatation is seen in 50 % of cases at autopsy.
2.
In the "'phlebectatic "'type, the blood-filled spaces are lined with endothelium and are associated with aneurysmal dilatation of the central vein; in the "'parenchymal "'type, the spaces have no endothelial lining and they usually are associated with haemorrhagic parenchymal necrosis.
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