title: [Ureteral obstruction secondary to aortofemoral bypass].
abstract: Hydroureteronephrosis is reported as a frequent late complication of aorto-femoral bypass grafts in patients with aorto-iliac obstruction. To define the actual incidence of this potentially critical complication, renal ultrasonography (US) was performed on 79 asymptomatic patients who had previously undergone aortic reconstruction, after a mean interval of 71.6 months. Unilateral hydronephrosis was found in 6 cases (7.6%). Dilatation was mild or moderate (grade I or II) in 4 cases, and severe (grade III) in 2. Ivp was performed in this selected group: hydronephrosis was mild in 3 patients with ureteral stenosis where the iliac limb of the graft crossed the ureter. In 2 cases nonfunctioning kidneys were demonstrated corresponding to severe sonographic hydronephrosis. These 2 patients underwent anterograde and retrograde pyelography, that showed the site and extent of the obstruction. One patient was a false positive because of obstruction of pyelo-ureteral junction. Even though X-rays showed high sensitivity and specificity in detecting this complication of aorto-femoral reconstruction, US is noninvasive and less expensive and does not require contrast medium. A routine pre- and post-operative ultrasound study is suggested in patients undergoing by-pass surgery to early recognise ureteral obstruction and to avoid irreversible renal damage.
authors.affiliation: Servizio di Radiologia, Policlinico S. Orsola-Malpighi, Bologna.
authors.forename: P
authors.initials: P
authors.lastname: Pavlica
authors.forename: G
authors.initials: G
authors.lastname: Viglietta
authors.forename: L
authors.initials: L
authors.lastname: Barozzi
authors.forename: A
authors.initials: A
authors.lastname: Piraccini
authors.forename: G
authors.initials: G
authors.lastname: Stasi
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000714:Anastomosis, Surgical / Q000009:adverse effects; D001012:Aorta, Abdominal / Q000601:surgery*; D005260:Female; D005263:Femoral Artery / Q000601:surgery*; D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology; D008297:Male; D008875:Middle Aged; D011859:Radiography; D014463:Ultrasonography; D014517:Ureteral Obstruction / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology*
vernacular_title: Ostruzione ureterale secondaria ad interventi di by-pass aorto-femorale.