title: Differential Diagnosis of Malignant Biliary Tract Cancer from Benign Tissues using Apparent Diffusion Coefficient Measurements with Diffusion Weighted Imaging in Asians.
abstract: BACKGROUND
  The aim of this meta-analysis was to assess the efficacy of the apparent diffusion coefficient (ADC) value of diffusion-weighted MRI (DWI) for differentiating biliary tract cancer (BTC) from benign biliary tract diseases in Asians.
  
  
  METHODS
  We systematically searched Embase and PubMed prior to December 2014. Eight studies conducted in Asians met our predetermined inclusion criteria.
  
  
  RESULTS
  Our meta-analysis results showed that ADC values in BTC tissues were significantly lower than in benign biliary tract tissues (SMD = -1.54, 95%CI: -1.75~-1.33, P<0.001). Subgroup analysis based on the MRI machine type showed that the ADC values were consistent, accurate and reliable in the diagnosis of BTC when comparing cancer tissue vs. benign tissue under the Siemens 1.5 T/3.0 T, Philips 1.5 T/3.0 T, GE 1.5 T, and Toshiba 1.5 T types, respectively (all P<0.05). Further, ADC values were still consistent and accurate in the differential diagnosis of BTC under the b value of 800 and 1000 s/mm2 (all P<0.05).
  
  
  CONCLUSIONS
  Our findings supported potential clinical applications of DWI ADC values in differentiating BTC from benign biliary tract diseases in Asians.
authors: Department of Interventional Radiology, Guizhou Cacer Hospital, Cacer Hospital of Guizhou Medical University, Guiyang, China E-mail : zhaoxy_327@163.com.
authors: Xu-Ya
authors: XY
authors: Zhao
authors: Shi
authors: S
authors: Zhou
authors: Da-Zhi
authors: DZ
authors: Wang
authors: Wei
authors: W
authors: He
authors: Jun-Xiang
authors: JX
authors: Li
authors: Shuai
authors: S
authors: Zhang
mesh_terms: D006801:Humans; D044466:Asian People; D001661:Biliary Tract Neoplasms / Q000175:diagnosis; D003937:Diagnosis, Differential; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D009369:Neoplasms / Q000175:diagnosis; D011379:Prognosis