Jaw is reached inside oral cavity facial skin forms most fistula hole, discharge pus for a long time, sometimes but eduction small sequestrum.

口颌面部皮肤形成多数瘘孔，长期排脓，有时可排出小骨片。

CT could clearly demonstrate the extent of bone involved,the destruction of cortex,periosteal reaction,change of soft tissue and sequestrum.

CT对病变范围、皮质、骨膜、软组织改变、骨邻近累与否显示更清楚。