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Acidophil stem cell PitNET/adenoma associated with lymphocytic inflammation. Histomorphology of an acidophil stem cell pituitary neuroendocrine tumor/adenoma composed of oncocytic cells with intracytoplasmic vacuoles reflecting giant mitochondria (arrow). This tumor showed well-marked accompanying lymphocytic inflammation as follicular aggregates (arrowheads). This case was classified as acidophil stem cell PitNET/adenoma with secondary lymphocytic hypophysitis
