Fig. 4

A The gross image of the tumor showed an 80-mm cauliflower-like shape with a gelatinous texture. B Histopathological examination demonstrated proliferation of spindle cells and collagen fiber, and the infiltration of plasma cells and lymphocytes (HE, × 40). C The myxoid change decreased toward the central region, and inflammatory cell infiltration, including neutrophils, increased instead (HE, × 100). D ALK expression was negative (ALK, × 400). HE hematoxylin eosin, ALK anaplastic lymphoma kinase