Figure 4.Histopathological and immunohistochemical features of the solid pseudopapillary neoplasm(A) Basophilic calcifications within hyalinized fibrous areas (arrows) (H&E, ×400). (B) Tumor with focal infiltration by foamy histiocytes (arrows) (H&E, ×400). (C) Cholesterol clefts accompanied by multinucleated giant cells (H&E, ×400). (D) Tumor cells showing positive nuclear immunostaining for β-catenin (immunohistochemistry, ×400).
