1. Histologically, the tumors were characterized by widespread myxoid, cyst formation, vessel wall hyalinization, and absence of mitoses.
   组织学检查，病变具有广泛的粘液样变、囊腔形成、血管壁透明变性和缺乏核分裂相等特点。
2. Figure 2.B, On high-power magnification microscopy, the specimen showed a patternless tissue culture-like appearance with multiple mitoses and extraasated red blood cells.
   图2B，高倍显微镜检查，标本显示无图案的“组织培养样”表现，伴有大量有丝分裂和红细胞外渗。

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