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1、CysticLesionsofthePancreasIntroductionThecysticlesionsofthepancreasarerelativelycommonfindings(rangingfrom2.4%to24%);Cysticlesionsofthepancreasmayrangefrombenigntomalignantandincludebothprimarycysticlesionsofthepancreasandsolidneoplasmsundergoingcysticdegeneration.IntroductionTheprimary
2、cysticlesionsofthepancreasincludeintraductalpapillarymucinousneoplasms,mucinouscysticneoplasms,serouscystadenomas,pseudocysts,andtrueepithelialcyst.Thesolidneoplasmsundergoingcysticdegenerationincludeneuroendocrinetumors,solidpseudopapillaryneoplasms,and,rarely,adenocarcinomaanditsvaria
3、nts.IntraductalPapillaryMucinousNeoplasm(IPMNs)IPMNsoriginatefromthemucinousepitheliumofthepancreaticductalsystemandarecharacterizedbyintraductalpapillarygrowthandabundantmucinproduction,leadingtoductaldilatation.IPMNsareclassifiedonthebasisofsiteoforiginofthepancreaticductalsystem:main
4、-ductIPMN;side-branchIPMN;andmixedIPMNinvolvingboththemainductandsidebranches.IPMNsoccurslightlymorecommonlyinmen,withameanageofoccurrenceof65years.theyaresymptomatic,presentationsincludeabdominalpain,weightloss,pancreatitis,andpancreaticinsufficiency.IntraductalPapillaryMucinousNeoplas
5、m(IPMNs)AtCT,amain-ductIPMNmaydemonstratediffuseorsegmentaldilatationofthemainpancreaticduct.AtMR,amain-ductIPMNmaydemonstratediffuseorsegmentalductaldilatation,withhypointenseT1andhyperintenseT2signal.Muralnodules,mucinglobules,oradilatatedmajororminorpapillabulgingintotheduodenallumen
6、maybeseen.Parenchymalatrophymayalsobepresent.IntraductalPapillaryMucinousNeoplasm(IPMNs)Main-ductIPMN.(1)CTimagedemonstratesdiffuseirregulardilatationofthemainpancreaticductwithheterogeneousintraductaldensities(arrow).(2)MRCPdemonstratesadilatedmainpancreaticductwithareasofirregularsten
7、osis(arrows).IntraductalPapillaryMucinousNeoplasm(IPMNs)Side-branchIPMNscanhavetwodifferentimagingappearances:amacrocysticpattern,inwhichthereisaunilocularormultilocularcystwithfewsepta,andamicrocysticpattern,inwhichmultiplethinseptaseparatenumerousfluid-filledspaces.Intraducta
