Figure 2
Pathologic photographs of patient 1. The gross specimen (A) appeared cortical surface expansile and rough with a small perforation (arrow), and the medullary cavity of the ulna was replaced by the solid grey white mass (B). Microscopy (C) demonstrated “Chinese characters” woven bone was separated by abundant fibrous stroma. No osteoblast and cellular atypia were identified (hematoxylin and eosin, 100×).