Fig. 4

Pathological findings of the schwannoma of the diaphragm. a The tumor is well encapsulated and measures 2.5 × 2.0 × 1.8 cm. b On the cut section, the tumor shows tan or yellow solid appearance. c In panoramic view, the tumor can be seen surrounded by a pink fibrous capsule and shows cystic abnormalities (*). d At low magnification, the tumor shows the pattern of alternating Antoni type A (right side) and type B areas (left side). In the Antoni type A area, spindle cells with bland twisted nuclei show nuclear palisading (inset). e Immunohistochemical staining shows that the S100 protein was diffusely expressed in the tumor cells. f Immunohistochemical staining shows that the SOX10 protein was diffusely expressed in the tumor cells