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Histologic features of acinic cell carcinoma. (a) Prominent microcystic and papillary pattern (H and E, ×200); (b) tumor cells with zymogen granules (H and E, ×200); (c) PAS with diastase (PAS-D) stain highlighting the zymogen granules (×200); (d) DOG-1 positive tumor cells (×200).
