title: Serous cystic neoplasm of the pancreas-indications for surgery.
abstract: OBJECTIVE
  Serous cystic neoplasm is a rare pancreatic tumor. Almost all of these tumors are benign and only 9 cases of serous cystadenocarcinoma have been reported. Although serous cystic neoplasm is typically a microcystic lesion, there is a wide range of cyst sizes from micro to macro and even unilocular cysts have been reported. Thus, the diagnosis is difficult and indications for surgery are controversial. We aimed to elucidate the clinicopathological and imaging features of serous cystic neoplasm of the pancreas.
  
  
  METHODS
  We investigated 15 cases of resected and 6 cases of nonresected cases of serous cystic neoplasm, evaluating the symptoms, imaging findings, preoperative diagnosis, macroscopic morphology, microscopic findings, and results of follow-up.
  
  
  RESULTS
  Imaging diagnosis of serous cystic neoplasm was not easy, because not so many tumors had the typical microcystic pattern. Most of the resected serous cystic neoplasms were non-microcystic or were small tumors, which could not be precisely evaluated.
  
  
  CONCLUSIONS
  Small serous cystic neoplasms, which can be diagnosed by imaging, do not need to be resected because serous cystadenocarcinoma is rare. Tumors of the pancreas that cannot be confirmed to be serous cystic neoplasm should be resected because of the possibility of pancreatic cancer, mucinous cystadenocarcinoma, or mucinous cystadenoma with malignant potential.
authors.affiliation: Departments of Digestive Surgery , Toranomon Hospital, Tokyo, Japan. masajih-ind@umin.ac.jp
authors.forename: Masqji
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Goro
authors.initials: G
authors.lastname: Watanabe
authors.forename: Masamichi
authors.initials: M
authors.lastname: Matsuda
authors.forename: Masaya
authors.initials: M
authors.lastname: Mori
mesh_terms: D000328:Adult; D000368:Aged; D003952:Diagnostic Imaging / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018297:Neoplasms, Cystic, Mucinous, and Serous / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D010190:Pancreatic Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*