弥散加权成像鉴别包膜期脑脓肿及合并坏死囊变脑肿瘤的价值

The imaging value of DWI in differentiation between brain abscess in Capsule-period and necrotic or cystic brain Tumors

目的探讨弥散加权在鉴别包膜期脑脓肿及合并坏死囊变脑肿瘤的应用价值。方法回顾性分析我科磁共振常规检查及DWI检查的并经过临床证实的脑脓肿12例,脑胶质瘤20例,脑转移瘤25例。常规检查采用SE-T1WI,TSE-T2WI横断位检查。DWI检查采用b=0,1000s/mm2。结果包膜期脑脓肿囊内DWI为低弥散,显示为高信号。坏死囊变脑胶质瘤、坏死囊变脑转移瘤等肿瘤囊内DWI为高弥散,显示为低信号。结论DWI能准确鉴别包膜期脑脓肿及颅内坏死囊变肿瘤。

Objective To discuss imaging value of DWI in differentiation between brain abscess in capsule-period and necrotic or cystic brain tumors. Methods 12cases with brain abscesses in capsule-period and 45 cases cystic or necrotic brain gliomas or metastases were performed with conventional MRI（Axioincisal SE-T1WI,TSE-T2WI） and diffusion-weighted imaging（b=0,1000s/mm^2）. Results Hyperintensity signal was seen in brain abscesses in capsule-period, but all cystic or necrotic brain tumors showed hypointensity signal on DWI. Conclusion We can distinguish brain abscess in capsuleperiod from cystic or necrotic brain tumors with DWI.