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1、中枢神经系统影像诊断协和医院放射科孔祥泉一、Examinationmethods1.X-rayplainfilmThismethodisverysimpleandcheap.Somelesionscanbefoundbyit.Usuallywecannotreachtoanexactdiagnosisonlybythisexamination2.TomographyExactdiagnosisstillcannotobtainedThemethodcanmanifestedsomeosseousdestructionwhichcan
2、notbeshownbyplainfilm.Enhancement:3.CTTodisplaytumors,hemorrhage,infarction,infectionandabnormality.Toshowtheabnormalisodensitywhichcannotfoundbytheplainscan.Toconfirmthequalityofthelesion.Differentialdiagnosisoftumorandedema.Plainscan:Thecharactersofthelesionincluding
3、size,appearance,number,position,anatomyrelation,andsooncanbeshownbyit.4.MagneticresonanceimagingPlainscan:Enhancement:Toshowtheabnormalisodensitywhichcannotfoundbytheplainscan.Toconfirmthequalityofthelesion.Differentialdiagnosisoftumorandedema.MRA:Toshowthevascularlesi
4、onssuchasaneurysmandarterialvenousmalformation.Todisplaytumors,hemorrhage,infarction,infectionandabnormality.Thecharactersofthelesionincludingsize,appearance,number,position,anatomyrelation,andsooncanbeshownbyit.5.DSAToshowthevascularlesionssuchasaneurysm,arterialvenou
5、smalformation.,bloodsupplyofneoplasm6.MyelographyToshowwhethertherearetumorsandobstructioninspinalcanal.Itisalsohelpfultoensurethepositionanddegreeofobstruction.一、Normalmanifestation（一）、Plainfilm1.CraniumTheinnerandouterplatearedenseandthediploeisspongy.2.SkullsutureAl
6、lofthesuturesareshownassawtoothshadow3.ConvolutionalimpressionsMultipleroundlowdensityinplainfilm.4.TheimpressionofthemiddlemeningealarteryTheimpresstionofthemiddlemeningealarteryispresentedasstreaksshadowandgooutfromwidetonarrow5.Impressionofdiploicvein7.TheSella:6.Im
7、pressionofpacchioniangranulation8.Internalauditorymeatus:About6mmwide,symmetricalcanalThefrontalparietalirregularhypodensitynearthemidline.Thediploicvein’simpressappearsasnetlikehypodensityintheparietalregion.7~16mmlong,7~14mmwideand8~20mmdeep.10.calcificationoffalxcer
8、ebri:9.Calcificationofpinealbody:11.Calcificationofchoroidplexus12Calcificationofpetro-clinoidligament:Itispresenteda
