title: Atypical spontaneous aorto-caval fistula: CT appearance.
abstract: CT findings of a clinically occult abdominal aorto-caval fistula secondary to atherosclerotic abdominal aortic aneurysm are presented. A review of 20 CT's demonstrating nonruptured abdominal aortic aneurysm was conducted. This review, in conjunction with the case presented, suggests that extensive caval effacement, with loss of the aorto-caval fat plane is an uncommon finding, and may indicate the presence of a thrombotically occluded aorto-caval fistula.
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001012:Aorta, Abdominal; D001014:Aortic Aneurysm / Q000000981:diagnostic imaging*; D001019:Aortic Rupture / Q000000981:diagnostic imaging*; D001164:Arteriovenous Fistula / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D014057:Tomography, X-Ray Computed; D014682:Vena Cava, Inferior / Q000000981:diagnostic imaging*