title: Biliary cystic intraductal papillary mucinous tumor and cystadenoma/cystadenocarcinoma: differentiation by CT.
abstract: OBJECTIVE
  To identify differential findings of biliary cystic intraductal papillary mucinous tumor (IPMT) and biliary cystadenoma/cystadenocarcinoma on CT images.
  
  
  METHODS
  Records of 7 patients with biliary cystic IPMT and 17 patients with biliary cystadenoma/cystadenocarcinoma were accessed. A pathologist reviewed gross morphologic and microscopic findings and confirmed the diagnosis. Two radiologists who were blind to the pathologic diagnosis reviewed CT images regarding size of cystic mass, mural nodule, septa, calcification, dilatation of the proximal, and distal bile ducts to the tumor, and the results were analyzed using multivariate analysis.
  
  
  RESULTS
  Mural nodule and dilatation of the bile ducts distal to the cystic tumor were more commonly seen in patients with cystic IPMT than in patients with biliary cystadenoma/cystadenocarcinoma and these are statistically significant, the P values being 0.029 and 0.016, respectively. Size of the cystic tumor, presence of septa, calcification, and dilatation of the bile duct proximal to the cystic tumor were not statistically different.
  
  
  CONCLUSIONS
  Biliary cystic IPMT could be differentiated from biliary cystadenoma/cystadenocarcinoma on CT images based on the presence of mural nodules and dilatation of the bile ducts distal to the cystic tumor.
authors: Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 Ilwon-dong, Kangnam-ku, Seoul 135-710, South Korea. jhlim@smc.samsung.co.kr
authors: Jae Hoon
authors: JH
authors: Lim
authors: Kee-Taek
authors: KT
authors: Jang
authors: Hyunchul
authors: H
authors: Rhim
authors: Young Sun
authors: YS
authors: Kim
authors: Kyu Taek
authors: KT
authors: Lee
authors: Sung Ho
authors: SH
authors: Choi
mesh_terms: D000328:Adult; D000368:Aged; D001659:Biliary Tract / Q000473:pathology*; D001661:Biliary Tract Neoplasms / Q000175:diagnosis*; D018282:Cystadenocarcinoma, Mucinous / Q000175:diagnosis*; D018291:Cystadenoma, Mucinous / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods*