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Immunohistochemical features. (A) Positive nuclear staining for PAX8. (B-C) Tumor cells negative for CK7 (B) and CK20 (C) except for scattered rare cells/vacuoles; arrow in (B) marks an entrapped renal tubule. (D) Weak membranous staining for CD117; arrow marks a mast cell. (E) Diffuse cathepsin-K immunoreactivity. (F) Retained SDHB expression.
