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Pathological diagnosis of Case 2. Acinar-like cell masses of different sizes are diffusely distributed, and some acinar cells are enlarged and proliferated, and the nucleus is (A) round or elliptical. Immunohistochemistry showed partial expression of (B) Ki-67 and high expression of (D) PRL and (C) TSH. The final pathological diagnosis is plurihormonal pituitary adenoma. PRL = prolactin, TSH = thyroid-stimulating hormone.
