title: Magnetic resonance imaging spectrum of solid pseudopapillary neoplasm of the pancreas.
abstract: OBJECTIVE
  To describe the magnetic resonance imaging spectrum of solid pseudopapillary tumors (SPTs), with an emphasis on solid SPTs.
  
  
  METHODS
  Thirty-two patients with proven SPTs with preoperative magnetic resonance were included. The SPTs were classified into 3 types: solid, cystic, and mixed; and 2 radiologists analyzed the images regarding the morphologic features and enhancement pattern.
  
  
  RESULTS
  Of 11 solid SPTs, 9 SPTs (81.8%) were less than 3 cm. Alternatively, of the 18 mixed SPTs and 3 cystic SPTs, 15 SPTs (71.4%) were larger than 3 cm. The predominant imaging features were homogeneous hypoenhancement with a gradually incremental enhancement pattern showing a sharp margin without hemorrhage, whereas those of the mixed SPTs were heterogeneous enhancement showing a sharp margin with internal hemorrhage.
  
  
  CONCLUSIONS
  Solid SPTs frequently present as small, well-defined tumors with a gradual enhancement and without hemorrhage or necrosis, and with features that differ from those of mixed or cystic SPTs.
authors.affiliation: From the *Department of Radiology, and †Institute of Radiation Medicine, Seoul National University Hospital, Seoul, Korea.
authors.forename: Seung Hoon
authors.initials: SH
authors.lastname: Chae
authors.forename: Jeong Min
authors.initials: JM
authors.lastname: Lee
authors.forename: Ji Hyun
authors.initials: JH
authors.lastname: Baek
authors.forename: Cheong Il
authors.initials: CI
authors.lastname: Shin
authors.forename: Mi Hye
authors.initials: MH
authors.lastname: Yoo
authors.forename: Jeong-Hee
authors.initials: JH
authors.lastname: Yoon
authors.forename: Jung Hoon
authors.initials: JH
authors.lastname: Kim
authors.forename: Joon Koo
authors.initials: JK
authors.lastname: Han
authors.forename: Byung Ihn
authors.initials: BI
authors.lastname: Choi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002291:Carcinoma, Papillary / Q000473:pathology* / Q000601:surgery; D002648:Child; D003287:Contrast Media; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000473:pathology* / Q000601:surgery; D012189:Retrospective Studies
chemical_list: D003287:Contrast Media