Fig. 1

Microscopic findings of epithelioid and spindle cells rhabdomyosarcoma: Hematoxylin-eosin staining shows tumor is primarily composed of epithelioid cells and spindle cells, epithelioid cells show prominent cellular pleomorphism with obvious nucleoli, abundant and brilliant eosinophilic cytoplasm (Fig. 1A), and visible mitotic figures (Fig. 1B), spindle cells show hyperchromatic nucleus with prominent nucleoli and brilliant eosinophilic cytoplasm (Fig. 1C), two components can intertwine with each other in some regions (Fig. 1D). Bar: 50 μm, 200x