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(A) High power photomicrograph, displaying medium-sized, mildly pleomorphic tumor cells, with clear cytoplasm, medium-sized round to oval nuclei with granular chromatin and inconspicuous nucleoli. Mitoses are relatively common. (Hematoxylin & Eosin ×400); (B) Tumor cells expressing strong cytoplasmic positivity for synaptophysin (Syn ×400).
