SMA staining was positive in basophilous small blocks, spindle or irregular cell cluster.Of the 218 cases, 56 cases had smooth muscle.

• 平滑肌肌动蛋白染色显示嗜碱性的小团状、梭形或不规则形的细胞束呈阳性反应，证明为平滑肌，218例中56例显示了平滑肌的存在。