Spindle-stellate cells with vague storiform pattern
Pale eosinophilic cytoplasm
Monomorphic ovoid nuclei; inconspicuous mitotic activity
Irregular woven bone trabeculae lined by osteoblasts
Delicate thin-walled vasculature; occasional osteoclasts
IHC: keratin (AE1/AE3), p63
In contrast to the osteofibrous dysplasia-like variant of adamantinoma, only single scattered keratin / p63 positivity is present
Spindle-polygonal cells with storiform pattern
Pale eosinophilic cytoplasm
Monomorphic ovoid nuclei; inconspicuous mitotic activity
Plump and irregular woven bone trabeculae lined by osteoblasts
Delicate thin-walled vasculature; occasional osteoclasts