Table 1.

Differential diagnosis of giant cell lesions of the bone (4).

Reactive	Benign	Malignant
Brown tumor	Giant cell reparative granuloma	Giant cell rich osteosarcoma
Haemophiliac pseudotumor	Nonossifying fibroma	Clear cell chondro-sarcoma
Intraosseous hemorrhage	GCT	Metastatic carcinoma
	Aneurysmal bone cyst	Undifferenciated pleomorphic sarcoma
	Chrondroblastoma	Malignant GCT (1–2%)

GCT, giant cell tumor.