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Serial sections stained with hematoxlin and eosin (A, C) and FH IHC (B, D). The neoplastic cells show completely negative staining for FH. In contrast, the non-neoplastic adrenal (arrows) and endothelial/stromal cells within the main tumor mass (arrowheads) demonstrate positive staining for FH in a granular cytoplasmic (mitochondrial) pattern and serve as an internal control.
