Fig. 3.

Initial intraoperative frozen section from the right distal femur shows fragments of trabecular bone with marrow elements, adjacent fibromyxoid tissue containing chronic inflammation, granulation tissue, hemosiderin-laden macrophages, rare foamy histiocytes, and multinucleated giant cells (Stain, hematoxylin and eosin; original magnification, ×10). These features are consistent with benign bone cysts.