title: Morphology and diameter of infrarenal aortic aneurysms: a prospective autopsy study.
abstract: OBJECTIVE
  To determine the diameter and morphology of infrarenal aortic aneurysms in 78 fresh autopsy specimens.
  
  
  METHODS
  To avoid underestimation of the arterial diameter postmortem and to re-establish aneurysm morphology, a device was designed and introduced into the vessel, inflated to 80 mm Hg, and the largest external diameter was measured.
  
  
  RESULTS
  The ages of the individuals ranged from 40 to 97 yr (mean 70). Thirty-eight aneurysms were ruptured with diameters ranging from 5.3 to 17.0 cm (mean 7.97), and 40 aneurysms were nonruptured with variations in diameters from 2.8 to 6.1 cm, mean 4.02 cm (P<0.01). Fusiform aneurysms were more frequent, and when they ruptured their diameters were smaller than the diameters of the spherical aneurysms (P<0.05). Aneurysms ruptured more frequently in the posterior wall (67%) and in the inferior portion (61%). A mural thrombus was found at the site of rupture in 80% of the specimens.
  
  
  CONCLUSIONS
  In our samples, rupture was found solely in those aneurysms with a diameter over 5.0 cm, ruptures occurred earlier in fusiform aneurysms, mural thrombus was not a protective factor, and finally, aneurysms ruptured mainly in the posterior and inferior portions.
authors.affiliation: Department of Surgery, São Paulo University School of Medicine, São Paulo, Brazil. ersimao@usp.br
authors.forename: E
authors.initials: E
authors.lastname: Simão da Silva
authors.forename: A J
authors.initials: AJ
authors.lastname: Rodrigues
authors.forename: E
authors.initials: E
authors.lastname: Magalhães Castro de Tolosa
authors.forename: C J
authors.initials: CJ
authors.lastname: Rodrigues
authors.forename: G
authors.initials: G
authors.lastname: Villas Boas do Prado
authors.forename: J C
authors.initials: JC
authors.lastname: Nakamoto
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017542:Aneurysm, Ruptured / Q000473:pathology*; D017544:Aortic Aneurysm, Abdominal / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies