Osteoblastoma/Osteogenic fibroma/Giant osteoid osteoma:
Rare rapidly growing benign lesion. 1% of all benign bone tumours. Resembles osteoid osteoma, but larger than 2cm. Occurs in older adolescents and young adults. M>F. Pain not always at night or relived by aspirin. Less bony reaction than osteoid osteoma. Most common bones are spine, skull and diaphysis of long bones.
25% have soft tissue mass.
Foot involvement is common.
X-ray – well-circumscribed radiolucent area surrounded by thin margin of reactive bone
Excision; chemotherapy; radiation therapy