Objective:To study CT features of delayed contusion and laceration of the brain,by which a new conception of interface sign was introduced and to evaluate its significance in prediction.

• 目的:研究迟发性脑挫裂伤的早期CT表现,提出“界面征”的概念,评价其对迟发性脑挫裂伤的早期诊断意义。