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Oncocytic adrenal cortical neoplasm with uncertain malignant potential composed of tumor cells with (a) eosinophilic granular and occasional vacuolated clear cytoplasms (H&E 200×), arranged in (b) a trabecular pattern with sinusoidal invasion (red arrow) (H&E 200×). Electron microscopy showed (c) many mitochondria, further confirmed by (d) an immunohistochemical stain of AMA, mES-13, revealing a strong, diffuse, and finely granular pattern of cytoplasms.
