Fig. 4

Histopathological findings. (a) Paraffin section (hematoxylin and eosin) revealed that the lesion mainly consists of osteocementum-like hard tissue with basophilic, irregular reversal lines (inset). Thin fibrous tissue (arrow) is observed between the lesion and surrounding tissue (4×). (b) The hard tissue was rimmed with plump cells (arrow, 40×). (c) The cellular atypia of tumoral cells was often outstanding (40×). Scale bar: a: 500 μm; b, c: 50 μm