title: [Diagnosis on the preoperative staging of rectal cancer by magnetic resonance imaging with water-bag in rectum].
abstract: OBJECTIVE
  To evaluate the accuracy of preoperative magnetic resonance imaging (MRI) with water-bag in rectum in prediction of pathological staging of rectal cancer.
  
  
  METHODS
  Clinical data of 19 patients with rectal carcinoma assessed by MRI with water-bag in rectum for tumour (T) and mesorectal nodal (N) staging were analyzed retrospectively. Preoperative MRI assessment was compared with postoperative histopathological findings.
  
  
  RESULTS
  The tumors were correctly staged by MRI in 15 patients, understaged in 2 and overstaged in 2. The accuracy of T stage was 78.9% (15/19). Mesorectal node were correctly staged in 11 patients, overstaged in 2 and understaged in 6. The accuracy of node staging was 57.9% (11/19), sensitivity was 3/9, and specificity was 80%(8/10).
  
  
  CONCLUSIONS
  Preoperative MRI with water-bag in rectum can not provide correct predictive data on mesorectal node stage, but has certain value in the T staging of rectal carcinoma.
authors.affiliation: Department of Anorectum, Traditional Chinese Medicine Hospital of Jiangsu Province, Nanjing University of Traditional Chinese Medicine, Nanjing 210046, China.
authors.forename: Chang-Qin
authors.initials: CQ
authors.lastname: Wu
authors.forename: Bo-Lin
authors.initials: BL
authors.lastname: Yang
authors.forename: Yun-Fei
authors.initials: YF
authors.lastname: Gu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging / Q000379:methods*; D012004:Rectal Neoplasms / Q000473:pathology*; D012189:Retrospective Studies