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Serial hematoxlin and eosin–stained (A, C), 2SC IHC-stained (B), and FH IHC-stained (D) sections. The non-neoplastic adrenal gland (asterisk) is negative for 2SC IHC, while the tumor cells show diffuse cytoplasmic expression. The non-neoplastic endothelial cells within the tumor mass (arrowheads) demonstrate positive staining for FH, in contrast to the PCC cells which are completely negative.
