Immunohistochemical findings of SCL. Immunohistochemical staining revealed that CD34 (A, IHC × 100) and vimentin (B, IHC × 200) were strongly positive in 40 cases of SCL. Non-fat spindle cells expressing S-100 protein with a cytoplasmic and nuclear pattern in 6 cases, of which case 18 was strongly positive for S-100 (C, IHC × 200), while case 20 was partly positive for S-100 (D, IHC × 200).