These were composed of vascular spaces which varied from small poorly canalized capillaries to larger, often slit-like, thin-walled vessels lined by a single layer of endothelial cells.

• 皮损组织病理检查示,真皮至皮下组织散在分布细胞团块,境界清楚,细胞团块由裂隙或不规则狭窄血管腔构成。