北京皮肤病医院哪最好 http://baidianfeng.39.net/a_zhiliao/150708/4652392.htmlA30-year-oldwomanwithahistoryofmultiplesclerosis,nowpresentingwithheadacheandconfusion.
A
B
C
Whatisyourdiagnosis?
TheanswerisBrainAbscess
Cerebralabscessclassicallyappearsasaring-like,thin-walledlesionongadolinium-injectedT1-weightedimages(figureAandB).
Hyperintensityondiffusion-weightedimaging(figureC)isduetothecelldebrisandviscosityoftheabscessthatrestrictfreewaterdiffusion.
DWIhelpstodifferentiateabscessfromtumorinthatthetumornecrosiswouldshowmarkedhypointensity.
Tumefactivedemyelinatinglesions,aformofmultiplesclerosis,mayshowanopen-ringpatternfacingthesulciofthecortex.
中文版：
女性，30岁，既往多发性硬化病史，近期出现头痛、思维混乱
诊断：脑脓肿
典型脑脓肿于T1WI增强图像表现为环形、薄壁的强化病变（A,B图）。
脓肿内含有细胞碎屑及粘稠的脓液，使水分子弥散受限，从而使病变在弥散加权成像表现为高信号（C图）。
而肿瘤坏死在DWI表现为低信号，因此，DWI有助于区别脑脓肿和脑肿瘤。
肿瘤样脱髓鞘是多发性硬化的一种特殊类型，通常表现为“开环”样强化，开环一侧朝向大脑皮层。
FromAJNRClassicCaseNovember7,
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