title: Pancreatic retention cyst: multi-modality imaging findings and review of the literature.
abstract: OBJECTIVE
  To investigate the multi-modality imaging presentation of the pancreatic retention cyst (PRC) with pathologic correlation.
  
  
  METHODS
  Imaging data including CT, MRI, endoscopic ultrasonography (EUS) and EUS guided fine needle aspiration (EUS-FNA), and endoscopic retrograde cholangiopancreatography (ERCP) in fifteen patients (five males and ten females; mean age, 44.5 years) with pathologically proven PRC were analyzed retrospectively, and imaging features were correlated with pathological findings.
  
  
  RESULTS
  Sixteen PRCs of 15 patients were included in this study. The mean size of PRCs was 4.4 × 4.6 cm (range 0.5 × 0.6-8.1 × 10.1 cm). PRC were round (n = 11), oval (n = 2), or lobular (n = 3). Punctiform calcification of the wall on CT (n = 2), thin septa (n = 4), thin wall (n = 3), and dilation of upstream pancreatic duct (n = 6; mean diameter, 4.3 mm) were detected. Dilation of upstream pancreatic duct was smooth in five PRCs and irregular in one PRC with pancreatic duct with punctiform calcification. Communication of PRCs with pancreatic duct was seen in two patients (one on CT, one on ERCP). Pancreatic inflammation and neoplasm were detected in four and two patients, respectively.
  
  
  CONCLUSIONS
  PRC typically presents as a well-defined, round cystic lesion, and different associated pathologic conditions including pancreatic inflammation and neoplasm may be detected in some patients on the multi-modality imaging examinations. Smooth dilation of upstream pancreatic duct with uncommon communication to the cyst may be helpful for the differentiation. Combination of a variety of imaging modalities could contribute to improve the diagnosis.
authors.affiliation: Department of Radiology, General Hospital of Lanzhou PLA, No. 333 Bin He Road (South), Lanzhou, 730050, Ganshu, People's Republic of China. renfangyuan@hotmail.com
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Ren
authors.forename: Changjing
authors.initials: C
authors.lastname: Zuo
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Jianhua
authors.initials: J
authors.lastname: Wang
authors.forename: Jianping
authors.initials: J
authors.lastname: Lu
authors.forename: Chengwei
authors.initials: C
authors.lastname: Shao
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Hao
mesh_terms: D000328:Adult; D044963:Biopsy, Fine-Needle; D002760:Cholangiopancreatography, Endoscopic Retrograde; D003952:Diagnostic Imaging; D038524:Diffusion Magnetic Resonance Imaging; D004108:Dilatation, Pathologic; D019160:Endosonography; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D061705:Image-Guided Biopsy; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010181:Pancreatic Cyst / Q000175:diagnosis* / Q000473:pathology; D010183:Pancreatic Ducts / Q000473:pathology