Malignant GCTB:
Histologic characteristics that are indicative of malignant GCTB are prominent nucleoli, a tumor diameter greater than 5 cm, elevated mitotic activity, necrosis and nuclear and cellular pleomorphism [28,29]. High Ki-67 proliferation index may also suggest malignant GCT [14,38,39], but Ki-67 >10% was seen in only 56% of malignant GCT in the series [39].