title: Abdominal US for diagnosis of pancreatic tumor: prospective cohort analysis.
abstract: OBJECTIVE
  To elucidate the accuracy of abdominal ultrasonography (US) in the diagnosis of pancreatic tumors.
  
  
  METHODS
  In all patients referred for pancreatic US during 1988-1990, data on malignant disease and survival were analyzed by using the Swedish Death and Cancer Registries. Nine hundred nineteen patients were entered into the analysis. In 140 of them, a clinical diagnosis of tumor in the pancreatic area was confirmed within 1 year after US. These tumors were primary pancreatic tumors (n = 102), common bile duct and duodenal cancers (n = 17), and metastases in the pancreatic area (n = 21).
  
  
  RESULTS
  The sensitivity of US in the detection of all tumors in the pancreatic area was 88.6% (124 of 140 patients), which was similar to that for the detection of exocrine pancreatic cancer, 90% (79 of 88 patients). There were nine false-positive US examinations, for a specificity of 98.8% (770 of 779 patients). Systematic sampling of 94 investigations confirmed an association between US accuracy and presence of clinical symptoms of pancreatic cancer. Significant differences in the sensitivity (P < .05) and accuracy (P < .01) of diagnosis were observed between three experienced investigators.
  
  
  CONCLUSIONS
  Study results support the use of US as a first-line diagnostic examination in patients suspected of having pancreatic tumor. Dependency on the investigator's experience with US mandates continuous evaluation of its performance.
authors.affiliation: Department of Surgery, University Hospital, Uppsala, Sweden. Britt-Marie.Karlson@Kirurgi.uu.se
authors.forename: B M
authors.initials: BM
authors.lastname: Karlson
authors.forename: A
authors.initials: A
authors.lastname: Ekbom
authors.forename: P G
authors.initials: PG
authors.lastname: Lindgren
authors.forename: V
authors.initials: V
authors.lastname: Källskog
authors.forename: J
authors.initials: J
authors.lastname: Rastad
mesh_terms: D000005:Abdomen / Q000000981:diagnostic imaging*; D003138:Common Bile Duct Neoplasms / Q000000981:diagnostic imaging; D004379:Duodenal Neoplasms / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D010190:Pancreatic Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D014463:Ultrasonography