Microcopic findings of a primary vaginal Ewing's sarcoma and/or primitive neuroectodermal tumour. (A) Sheets of undifferentiated malignant round cells, Hematoxylin and Eosin, ×200 magnification. (B) Tumor cells displaying membranous positivity with MIC2/CD99. DAB × 400. (C) Tumor cells displaying FLI1 positivity, DAB ×400. (D) Tumor cells negative for cytokeratin, DAB ×400. (E) Areas displaying BCL2 positivity, DAB ×400.