title: Clinical utility of endoscopic ultrasound elastography for identification of malignant pancreatic masses: a meta-analysis.
abstract: OBJECTIVE
  Endoscopic ultrasound (EUS) elastography is not used for detection but rather for characterization of solid pancreatic masses. A meta-analysis was used to assess the accuracy of EUS elastography for identification of malignant pancreatic masses.
  
  
  METHODS
  PubMed, the Cochrane Library, and the ISI Web of Knowledge were searched. The studies relating to evaluation accuracy of qualitative or quantitative EUS elastography for identification of malignant pancreatic masses were collected. Language was limited to English. The sensitivity and specificity were used to examine the accuracy. Clinical utility was evaluated by likelihood ratio scattergram.
  
  
  RESULTS
  A total of 10 studies including 893 pancreatic masses (646 malignant, 72.3%) were analyzed. The summary sensitivity and specificity for the diagnosis of malignant pancreatic masses were 0.98 (95% confidence interval [CI] 0.93-1.00) and 0.69 (95% CI 0.52-0.82) for qualitative EUS elastography, and 0.96 (95% CI 0.86-0.99) and 0.76 (95% CI 0.58-0.87) for quantitative EUS elastography, respectively. The hierarchical summary receiver operating characteristic curves were 0.94 and 0.93 for qualitative and quantitative EUS elastography. The accuracy of quantitative methods was similar to qualitative methods. The positive and negative likelihood ratios were 3.15 and 0.03 for qualitative EUS elastography, and 3.94 and 0.05 for quantitative EUS elastography, respectively. Both qualitative and quantitative methods were useful for exclusion of presence of malignant pancreatic masses and not for its confirmation.
  
  
  CONCLUSIONS
  EUS elastography could be used as a good identification tool for benign and malignant pancreatic masses, with its good performance for exclusion of presence of malignant pancreatic masses.
authors.affiliation: Department of Ultrasonography, Institution of Hepatology, The First Affiliated Hospital of Wenzhou Medical College, Wenzhou, China.
authors.forename: Li
authors.initials: L
authors.lastname: Ying
authors.forename: Xiao
authors.initials: X
authors.lastname: Lin
authors.forename: Zuo-Liu
authors.initials: ZL
authors.lastname: Xie
authors.forename: Yuan-Ping
authors.initials: YP
authors.lastname: Hu
authors.forename: Kai-Fu
authors.initials: KF
authors.lastname: Tang
authors.forename: Ke-Qing
authors.initials: KQ
authors.lastname: Shi
mesh_terms: D003937:Diagnosis, Differential; D054459:Elasticity Imaging Techniques / Q000379:methods*; D019160:Endosonography / Q000379:methods*; D006801:Humans; D010190:Pancreatic Neoplasms / Q000000981:diagnostic imaging*; D012680:Sensitivity and Specificity
keywords: EUS elastography; diagnostic accuracy; pancreatic masses; sensitivity; specificity