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本期病例选自AJNRCaseoftheWeek
RobertoSchubertRadiologieamEuropa-CenterBerlin,GermanyDescription
A19-year-oldmanwhonoticedasymmetryofhisshoulderswhileshaving
19岁男性,刮脸时发现双肩不对称。
AxialT1FSEandSTIR(A):
AxialT2WI(B):
sagittalFLAIR(C):
axialDWI(D):
axialCET1WGREMRsequences(E):
Legends
AxialT1FSEandSTIR(A)showingvolumelossandincreasedSTIRsignaloftherighttrapeziusmuscle.AxialT2WI(B),sagittalFLAIR(C),axialDWI(D),andaxialCET1WGREMRsequences(E)showanextraxialcysticlesion(asterisk)locatedintherightcerebello-medullarycistern,betweenLuschkasforamen,thepetrosalsurfaceofthecerebellarhemisphere,andthejugularforamen,withforwarddisplacementofthevagusandaccessorynerverootsispresent(arrowhead).ThecystfollowsCSFsignalinallpulsesequenceswithnorestricteddiffusionorenhancement.
横断位T1FSE和STIR(A)示右侧斜方肌体积变小,STIR信号增高。
横断位T2WI(B)、矢状位T1WI(C)、横断位DWI(D)、横断位增强T1WIGRE(E)序列示右侧桥小脑角区囊性占位(星号),病灶位于四脑室外侧孔、小脑半球颞骨岩部侧、颈静脉孔之间,迷走神经及副神经受压向前移位(箭头)。囊液在各个序列均与脑脊液呈等信号,弥散不受限。
ArachnoidCystwithAccessoryNervePalsy
蛛网膜囊肿伴副神经麻痹
Background
Injuriestotheaccessorynervearerareandmaycauseunpredictablemotordefectsintheneck,includingtrapeziusmuscleweakness/atrophy.
副神经损伤临床少见,可引起颈部运动障碍,包括斜方肌无力/萎缩。
Intheabsenceofpriortraumaorsurgery,aspace-occupyingposteriorfossaoruppercervicallesionshouldbesought.
如果没有外伤或手术病史,则需要仔细寻找后颅凹占位或上颈椎的病变。
KeyDiagnosticFeatures
Muscledenervation:SignalincreaseonSTIRisearliestMRsign(precedesatrophy).
肌肉退变:STIR信号增高是最早发生的MR改变(早于肌肉萎缩)
Arachnoidcyst:Extra-axiallesionfollowingCSFsignalonallMRsequences(imperceptiblewall,noenhancementorrestricteddiffusion).Remodelingofadjacentbonemaybepresent.
蛛网膜囊肿:脑外占位,各序列均呈脑脊液信号(囊壁菲薄,增强无强化,弥散无受限)。有时可见临近骨质改变。
DDx
Epidermoidcyst
表皮样囊肿
Neurentericcyst
神经根原肠囊肿
Cysticschwannoma
囊性许旺氏细胞瘤
TreatmentOption
Neurosurgicalde呼和浩特治疗白癜风的医院湖北治疗白癜风的医院
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