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CPA少见肿瘤.ppt

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小脑桥脑角区罕见肿瘤诊断引言起源于CPA的肿瘤表皮样囊肿Arachnoidcystina27-year-oldwomanwithheadaches.(a)AxialT1-weightedMRimageshowsanarachnoidcystwithsignalintensitysimilartothatofCSFstretchingtheleftseventhandeighthcranialnervecomplex(arrow).(b)AxialT2-weightedMRimageshowsthelobulatedmarginsofthecystimpingingonthepons(arrowhead).(c)AxialheavilyT2-weighted(constructiveinterferenceinthesteadystate)MRimageshowstheextentofthetumor.蛛网膜囊肿Arachnoidcystina27-year-oldwomanwithheadaches.(a)AxialT1-weightedMRimageshowsanarachnoidcystwithsignalintensitysimilartothatofCSFstretchingtheleftseventhandeighthcranialnervecomplex(arrow).(b)AxialT2-weightedMRimageshowsthecystdisplacingthevascularstructuresoftheCPA(arrowheads).脂肪瘤Lipomaina7-year-oldboywithapolymalformationsyndrome.(a)AxialCTscanshowsawell-definedhypoattenuatinglipomaoftheleftCPA.(b)AxialT1-weightedMRimageshowsthatthelipomahassignalintensitysimilartothatofsubcutaneousfat.神经鞘瘤Schwannomaina34-year-oldmanwithrighttrigeminalneuralgia.Contrastmaterial-enhancedaxialT1-weightedMRimageshowsahomogeneous,enhanced,dumbbell-shapedrighttrigeminalschwannomainvolvingthecisternalpartofthenerveandMeckelcave.Schwannomaina52-year-oldwomanwithleftearpain.(a)Gadolinium-enhancedcoronalT1-weightedMRimageshowsanenhancingschwannomaoftheninth,10th,and11thcranialnervesinthelowestpartoftheCPA.(b)CoronalT2-weightedMRimageshowstheextentoftheschwannomaalongthecourseofthenerves(arrows)andbeneaththenormalleftinternalauditorycanal(arrowheads).(c)AxialCTscanshowssmootherosionoftheskullbaseandespeciallythejugularforamenbytheschwannoma.后颅窝动脉瘤AxialT2-weightedMRimageshowsananeurysmoftheleftposteriorinferiorcerebellararterywithtypicallackofsignal(arrow).Aneurysmina75-year-oldmanwithhypoglossalnervepalsy.(a)AxialT2-weightedMRimageshowsathrombosedaneurysmoftherightposteriorinferiorcerebellararterywithfocalcalcification(arrowhead).Notethenormalrighthypoglossalcanal(arrow),afindinginconsistentwithaschwannoma.(b)Contrast-enhancedcoronalT1-weightedMRimageshowshomogeneousenhancementoftheorgan