title: [The diagnostic value of conventional MRI in the differentiation of malignant tumor from benign lesion in prostatic peripheral zone].
abstract: OBJECTIVE
  To evaluate the diagnostic capabilities of conventional MRI (T1WI, T2WI and Gd-enhancement T1WI) for differentiating prostate cancer from benign prostatic disorders in prostatic peripheral zone (PZ).
  
  
  METHODS
  Respectively analyze the characteristics of conventional MRI in 46 cases of prostate cancer and 25 cases of benign prostatic disorders (with 28 lesions). Six indexes were initially screened by Chi2-test, and receiver operating characteristic curves (ROC) of these indexes were depicted, then Bayes discriminator was applied to discriminate all the lesions according to the indexes with statistic meaning. The discriminant function was evaluated with new sample validation.
  
  
  RESULTS
  The indexes showing statistics meaning between prostate cancer and benign prostatic disorders were uniform low SI on T2WI, shape, pseudocapsule extension, prostate-capsule extension, size change of PZ with lesion and enhancement style. Furthermore, uniform low SI on T2WI, enhancement style and size change of PZ with lesion were consist of the function after discrimination, AUC of these 3 indexes were all above 0. 7, which were wider than that of the other 3 indexes. The discriminating accuracy rates of the new sample for benign prostatic disorders and prostate cancer were 83% and 77%.
  
  
  CONCLUSIONS
  The importance of uniform low SI on T2WI, enhancement style and size change of PZ with lesion should be highlighted in the differentiation of prostate cancer and benign prostatic disorders in PZ.
authors.affiliation: Department of Radiology, West China Hospital, Sichuan University, Chengdu, 610041, China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Zhou
authors.forename: Shuang
authors.initials: S
authors.lastname: Zhao
authors.forename: Jiao
authors.initials: J
authors.lastname: Bai
authors.forename: Ling
authors.initials: L
authors.lastname: Yang
authors.forename: Rong-Bo
authors.initials: RB
authors.lastname: Liu
mesh_terms: D001499:Bayes Theorem; D003937:Diagnosis, Differential; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D011470:Prostatic Hyperplasia / Q000175:diagnosis; D011471:Prostatic Neoplasms / Q000175:diagnosis*; D012372:ROC Curve