monfindings(%to24%);,eoplasms,serouscystadenomas,pseudocysts,,solidpseudopapillaryneoplasms,and,rarely,(IPMNs)IPMNsoriginatefromthemucinousepitheliumofthepancreaticductalsystemandarecharacterizedbyintraductalpapillarygrowthandabundantmucinproduction,:main-ductIPMN;side-branchIPMN;,,presentationsincludeabdominalpain,weightloss,pancreatitis,(IPMNs)AtCT,amain-,amain-ductIPMNmaydemonstratediffuseorsegmentalductaldilatation,,mucinglobules,(IPMNs)Main-ductIPMN.(1)CTimagedemonstratesdiffuseirregulardilatationofthemainpancreaticductwithheterogeneousintraductaldensities(arrow).(2)MRCPdemonstratesadilatedmainpancreaticductwithareasofirregularstenosis(arrows).IntraductalPapillaryMucinousNeoplasm(IPMNs)Side-branchIPMNscanhavetwodifferentimagingappearances:amacrocysticpattern,inwhichthereisaunilocularormultilocularcystwithfewsepta,andamicrocysticpattern,inwhichmultiplethinseptaseparatenumerousfluid-(IPMNs)AtCT,Side-branchIPMNsusuallyappearashypoattenuatingheterogeneouslesionsandareclassicallylocatedintheuncinateprocess,,side-branchIPM
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