Primitive neuroectodermal tumors of the abdominal wall and vulva in children: Report of two cases and review of the literature

Figure 3 Case 1. A and B: Small round cells with large nuclei and little cytoplasm showing the characteristic perivascular rosette of primitive neuroectodermal tumors (H and E, 100× and 200×); C: Tumor cells positive for CD99 (DAB, 200×); D: Diffuse staining for Syn (DAB, 200×).