脑结核瘤的低场MRI诊断

Low Field MRI Diagnosis of Intracranial Tuberculoma

目的:研究磁共振成像对脑结核瘤的影像学诊断价值。方法:对9例经临床随访证实的脑结核瘤MRI表现及Gd-DTPA强化的特点进行回顾性分析,总结其影像学特征。所有患者均行FLAIR T1WI,FSE T2WI,Gd-DTPA增强扫描。结果:本组9例共发现病灶21个,单发2例,多发7例。未成熟结核结节呈长T1、长T2信号,注射对比剂后呈结节状强化。成熟结核结节在T2WI呈典型的"靶征",增强后呈结节状或环形强化。结论:脑结核瘤的MRI特征表现为多发病灶,靶征及环状强化,这对确立诊断有非常重要的价值。

Objective To study low field MRI diagnosis of cerebral tuberculoma. Methods MRI features were retrospectively analyzed in 9 patients with intracranial tuberculoma confirmed by follow-up of anti-tuberculosis therapy.All patients were imaged by MR scanner with FLAIR T1WI,FSE T2WI,Gd-DTPA enhanced T1WI. Results Altogether 21 lesions were found in all 9 patients.The 2 patients had single lesion,7 patients had multiple lesions.Immature tuberculoma showed hypo-intensity signal on T1WI and hyper-intensity signal on T2WI,and nodular enhancement after contrast injection.Mature tuberculoma showed typical target sign on T2WI, and showed nodular or annular enhancement.Conclusion MRI features of intracranial tuberculoma are multiple focitarget sign and ring enhancement,which plays an important role in establishing the diagnosis.