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A. Hematoxylin-eosin (H&E) staining of the primary pulmonary primitive neuroectodermal tumor. B. and C. Immunohistochemistry staining of the primary tumor with different antibodies, such as anti-CD99, vimentin, NSE, synaptophysin (Syn), friend leukemia integration 1 transcription factor (Fli-1) and chromogranin A (CgA).
