title: A case of solid pseudopapillary neoplasm of the pancreas and tumor doubling time.
abstract: BACKGROUND
  Solid pseudopapillary neoplasm of the pancreas is a rare tumor with unique clinicopathological features. Although it is considered to grow slowly, little is known about its doubling time.
  
  
  METHODS
  We encountered a young Japanese woman with a solid pseudopapillary neoplasm of the pancreas that had been detected at another hospital 5 years previously but was resected at our hospital. The tumor showed only a solid component without any cysts. Computed tomographic scans taken 5 years apart were compared to determine the tumor doubling time.
  
  
  RESULTS
  The tumor doubling time according to the formula of Schwartz and co-workers was determined to be 765 days.
  
  
  CONCLUSIONS
  These findings confirm that this tumor grows quite slowly and also support long disease-free periods even in patients who have recurrence or metastases.
authors.affiliation: Department of Internal Medicine, Tokyo Metropolitan Komagome Hospital, Japan.
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Kato
authors.forename: Naoto
authors.initials: N
authors.lastname: Egawa
authors.forename: Terumi
authors.initials: T
authors.lastname: Kamisawa
authors.forename: Yuyang
authors.initials: Y
authors.lastname: Tu
authors.forename: Masaki
authors.initials: M
authors.lastname: Sanaka
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Sakaki
authors.forename: Atsutake
authors.initials: A
authors.lastname: Okamoto
authors.forename: Nobuko
authors.initials: N
authors.lastname: Bando
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Funata
authors.forename: Toru
authors.initials: T
authors.lastname: Isoyama
mesh_terms: D000328:Adult; D002291:Carcinoma, Papillary / Q000473:pathology* / Q000601:surgery*; D002455:Cell Division / Q000502:physiology*; D005260:Female; D006801:Humans; D007700:Kinetics; D010190:Pancreatic Neoplasms / Q000473:pathology* / Q000601:surgery*; D013997:Time Factors; D016896:Treatment Outcome