Figure 4b. (a) Low-power photomicrograph (original magnification, x40; hematoxylin-eosin stain) shows that the tumor is moderately cellular with necrotic and fibrotic transformed areas (white arrows) and numerous dystrophic calcifications (black arrows). (b) High-power photomicrograph (original magnification, x200; hematoxylin-eosin stain) shows that the tumor is moderately cellular and highly vascularized with numerous branching thin-walled vessels (arrowhead). Some of the vessels are typically surrounded by a fibrillar and acellular zone (pseudorosettes) (arrows).