Figure 4a. (4a) Photomicrograph (original magnification, x40; hematoxylin-eosin stain) demonstrates a cellular focus of tumor composed of spindle cells that are somewhat haphazardly arranged. (4b) Higher-power photomicrograph (original magnification, x200; hematoxylin-eosin stain) shows that the spindle cells contain a moderate amount of eosinophilic cytoplasm. Necrosis is not present.