A variant of Giant cell tumor is?
Ossifying fibroma
Non ossifying fibroma
Osteosarcoma
Chondroblastoma
GCT is adult counterpart of chondroblastoma. Chondroblastoma is an epiphysis tumor which occurs in the 2nd decade (10-20 years), while GCT is an epiphysis tumor which occurs in adults (20 - 40 years).