颅脑ＣＴ增强扫描其强化程度及类型对病变组织有一定特异性，是颅脑占位性病变诊断与鉴别的主要方法。环形强化灶是指病变区出现环形高密度影，其性质之判断可行延迟扫描，囊肿则为持续低密度而实质性肿瘤可发生强化。本文旨在提高对颅内环形强化病灶的认识及诊断与鉴别诊断水 Cranial enhanced CT scan intensity and type of lesion has a certain specificity, is the main method of diagnosis and differential diagnosis of brain lesions. Annular enhanced focus refers to the presence of ring-shaped lesions of high density, the nature of the line to determine the feasibility of delayed scanning, the cyst is sustained low density and substantial tumor can occur to strengthen. The purpose of this article is to raise awareness of intracranial annular enhancement lesions and to diagnose and differentiate the water