title: [Contribution of MRI in the staging of cancer of the bladder. Apropos of 40 cases].
abstract: 56 patients with bladder carcinoma were examined by magnetic resonance in the pre-operative staging. In 40 patients where total cystectomy with enterocystoplasty and pelvic node dissection were performed, a good correlation with surgical and pathologic findings was obtained. MR examination using T1 (TR 400 ms, TE 28 ms) and T2 (TR 1,200-1,600 ms, TE 40 80 120 ms) weighted images in different planes where performed after biopsy of the bladder tumor through endoscopy and within 1 or 2 weeks before surgery. Neoplasms were characterized by site, size and growth pattern. Extension through the deep muscle of the bladder wall was correctly identified in 95% with a sensitivity of 95% and a specificity of 95%. Extension through perivesical fat was assessed accurately in 85% with a sensitivity of 66% and a specificity of 100%. Accuracy in evaluating invasion of adjacent organs was 85%, sensitivity 44%, specificity 96%. Lymphadenopathy has been accurately assessed in 97.5% with a sensitivity of 83% and a specificity of 100%. MR correctly staged the tumor according to TNM classification in 24/40 (60%) patients, overestimated the extension in 3/40 (7.5%) and underestimated the extension in 13/40 (32.5%).
authors.affiliation: Hôtel-Dieu de Paris, Service de Radiologie.
authors.forename: J N
authors.initials: JN
authors.lastname: Buy
authors.forename: M
authors.initials: M
authors.lastname: Ghossain
authors.forename: C
authors.initials: C
authors.lastname: Guinet
authors.forename: F
authors.initials: F
authors.lastname: Richard
authors.forename: M
authors.initials: M
authors.lastname: Doucet
authors.forename: J M
authors.initials: JM
authors.lastname: Bigot
authors.forename: D
authors.initials: D
authors.lastname: Vadrot
authors.forename: M
authors.initials: M
authors.lastname: Laval-Jeantet
authors.forename: J
authors.initials: J
authors.lastname: Ecoiffier
mesh_terms: D000328:Adult; D000368:Aged; D002295:Carcinoma, Transitional Cell / Q000473:pathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D001749:Urinary Bladder Neoplasms / Q000473:pathology*
vernacular_title: Apport de l'IRM dans le bilan d'extension des cancers de vessie. A propos de 40 cas.