<unk>  is (FCMB) is an extremely rare tumor first described in 1984. About 26 cases have been reported in literature, with patient ages spanning from 9 to 25 years, though a case in a male infant aged 1 year and 7 months has been reported. Quick growth and bulky size are remarkable features of this tumor.
Fibrocartilaginous mesenchymoma of bone
Juvenile active ossifying fibroma
Peripheral ossifying fibroma
Osteoblastoma
Solitary fibrous tumor
Malignant ectomesenchymoma
Giant-cell tumor of bone
Aneurysmal bone cyst