Pathology: osteoblastoma
Osteoblastoma
Fibro-osseous neoplasm
Anastomosing trabeculae of woven bone with prominent osteoblastic rimming
Polygonal-epithelioid cells with abundant eosinophilic cytoplasm; ovoid nuclei with small nucleoli, minimal pleomorphism, and inconspicuous mitotic activity
Interspersed osteoclast-type multi-nucleated giant cells
Osteoblastoma
Fibrous-osseous neoplasm
Anastamosing trabeculae of woven bone with prominent osteoblastic rimming
Polygonal-epithelioid cells with abundant eosinophilic cytoplasm; ovoid nuclei with small nucleoli, minimal pleomorphism, and inconspicuous mitotic activity
Interspersed osteoclast-type multi-nucleated giant cells
IHC: SATB2
Prior history of "osteoid osteoma" treated by radiofrequency ablation
Osteoblastoma
Fibrous-osseous neoplasm
Anastamosing trabeculae of woven bone with prominent osteoblastic rimming
Polygonal-epithelioid cells with abundant eosinophilic cytoplasm; ovoid nuclei with small nucleoli, minimal pleomorphism, and inconspicuous mitotic activity
Interspersed osteoclast-type multi-nucleated giant cells
IHC: SATB2