A59-year-oldwomanwithnewlydiagnosedsquamouscellcarcinomaofthelung
A
B
C
Whatisyourdiagnosis?
TheanswerisAtreticParietalCephalocele
Atreticcephaloceleisatruecephalocelethatconsistsofdura,fibroustissue,anddysplasticbraintissue.Theclassicimagingfeaturesmayincludeawell-definedcalvarialdefect(longarrowinA)withanadjacentroundscalplesionwithlowT1signal(shortarrowinA),heterogeneousT2signal(arrowinB),andnoenhancementatthemedianparietalconvexity.Anupward-pointingprimitivefalcineveinreplacesthestraightsinus(asterisk).Topdifferentialsincludedermoid/epidermoidcysts,whichtypicallyhavehighsignalonT1-anddiffusion-weightedimages.Sinuspericraniitypicallyhasvascularenhancement.Moreaggressivelesionssuchasmetastasesusuallyhaveac白癜风诚信企业白癜风发病的机制是什么
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