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

平滑肌肌动蛋白染嗜碱性的小团状、梭或不规则的细胞性反应，证明为平滑肌，218例中56例了平滑肌的存在。