title: CT of lymphoepithelial cysts of the pancreas.
abstract: OBJECTIVE
  To clarify imaging and clinicopathologic features of lymphoepithelial cysts (LEC), a benign lesion of the pancreas.
  
  
  METHODS
  Two male patients with LECs that were found incidentally and proven surgically were reviewed.
  
  
  RESULTS
  Sonography revealed a hypoechoic mass in both cases, one of which had septation and an intracystic isoechoic component within it. The mass was shown as low attenuation on unenhanced CT, and the intracystic solid component was not enhanced by dynamic CT or computed tomographic arteriography. One lesion had calcifications around the mass. Magnetic resonance imaging showed hyper- in hypointensity on T1-weighted imaging and hypo- in hyper- on T2-weighted imaging in one case. Both lesions were located on the surface of the head of the pancreas, and the main pancreatic ducts appeared normal on endoscopic retrograde pancreatography. Both patients were asymptomatic.
  
  
  CONCLUSIONS
  These imaging and clinical findings suggest LEC, which should be considered when one encounters cystic lesions of the pancreas.
authors.affiliation: Department of Diagnostic Radiology, National Cancer Center Hospital, Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Koga
authors.forename: K
authors.initials: K
authors.lastname: Takayasu
authors.forename: K
authors.initials: K
authors.lastname: Mukai
authors.forename: Y
authors.initials: Y
authors.lastname: Muramatsu
authors.forename: Y
authors.initials: Y
authors.lastname: Mizuguchi
authors.forename: H
authors.initials: H
authors.lastname: Furukawa
authors.forename: F
authors.initials: F
authors.lastname: Wakao
authors.forename: K
authors.initials: K
authors.lastname: Ushio
authors.forename: T
authors.initials: T
authors.lastname: Kosuge
authors.forename: K
authors.initials: K
authors.lastname: Shimada
mesh_terms: D006801:Humans; D008297:Male; D008875:Middle Aged; D010179:Pancreas / Q000000981:diagnostic imaging / Q000473:pathology; D010181:Pancreatic Cyst / Q000000981:diagnostic imaging* / Q000473:pathology; D014057:Tomography, X-Ray Computed