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Alveolar Rhabdomyosarcoma. A. Low power image showing a nested alveolar pattern of arrangement of the tumor cells with the nests separated by fibrous septa. (H&E, 100x) B. High power image showing medium-sized tumor cells with scattered giant cells. (H&E, 400x) C. High power image showing solid variant with sheets of medium-sized tumor cells. (H&E, 400x) and D. Immunohistochemical stain for Myogenin showing diffuse positivity.
