title: MR imaging with STIR technique and air insufflation for local staging of bladder neoplasms.
abstract: Fifty-six patients with bladder carcinoma were studied with MR imaging for the assessment of the local stage, using the inversion recovery pulse sequence with fat suppression (STIR) with air in the bladder. With this technique images of the inner and the outer parts of the bladder wall were obtained, showing high contrast between the latter and the tumor (tumor/muscle contrast 89.9%). Four tumor stages were recognized: superficial neoplasms (Tis, Ta, and T1), partial wall infiltrating neoplasms (T2); total wall infiltrating neoplasms (T3a, T3b), and neoplasms involving other pelvic organs (T4). MR imaging was compared with histopathologic diagnosis obtained at transurethral resection or cystectomy. True-positive diagnosis was obtained in 80.4%; false-positive in 14.3% of cases; false-negative in 5.3%. Despite the relatively high incidence of overstaged neoplasms, STIR technique combined with air in the bladder allowed a good accuracy in local staging.
authors.affiliation: Department of Radiology, University of Pisa, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Bartolozzi
authors.forename: D
authors.initials: D
authors.lastname: Caramella
authors.forename: V
authors.initials: V
authors.lastname: Zampa
authors.forename: M
authors.initials: M
authors.lastname: Olmastroni
authors.forename: P
authors.initials: P
authors.lastname: Innocenti
authors.forename: I
authors.initials: I
authors.lastname: Menchi
authors.forename: A
authors.initials: A
authors.lastname: Lapini
authors.forename: A
authors.initials: A
authors.lastname: Amorosi
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; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D011446:Prospective Studies; D001749:Urinary Bladder Neoplasms / Q000175:diagnosis / Q000473:pathology*