Fig. 1

a Calcified and ossified sclera flap, with bone trabeculae and intertrabecular spaces inhabited by adipose and hematopoietic medullary elements. There are areas more densely cellulated and occupied by small round cells with little lymphoid-looking cytoplasm (EE= Hematoxylin and Eosin (H&E) × 10 after decalcification treatment). b Homogeneous, small-sized lymphoid cells occupying the entire intertrabecular space (EE= Hematoxylin and Eosin (H&E) × 40 after descaling treatment). c Immunohistochemical staining with CD20 demonstrates the B lymphoid differentiation of the neoplastic population, occupying the medullary intertrabecular spaces of the newly formed metaplastic bone