OBJECT: In this retrospective study the authors examined the aspect ratio (AR; the maximum dimension of the dome/width of the neck of an @entity439 ) and compared the distribution of this ratio in a group of @entity1756 . A similar comparison was performed in relation to the maximum dimension of the @entity439 alone. The authors sought to evaluate the utility of these measures for differentiating @entity1756 . METHODS: Measurements were made of 774 @entity439 in 532 @entity1 at three medical centers. One hundred twenty-seven @entity1 harbored only unruptured lesions, 290 only @entity75 , and 115 both @entity75 . Cases were included if angiograms were available for measurement and the status of the individual @entity1 's @entity439 (s) was known. The odds of a lesion falling in the ruptured @entity439 group increased with both the lesion's maximum size and the AR. The odds ratio for @entity397 rose progressively only for the AR. The distribution curves showed that @entity1756 were larger and had greater ARs. The mean size of @entity439 was 7 mm and that of ruptured ones was 8 mm; the corresponding mean ARs were 1.8 and 3.4, respectively. The odds of @entity397 were 20-fold greater when the AR was larger than 3.47 compared with an AR less than or equal to 1.38. Only 7% of @entity1756 had an AR less than 1.38 compared with 45% of unruptured lesions. CONCLUSIONS: The AR is probably a useful index to calculate. A high AR might reasonably influence the decision to treat actively an unruptured @entity439 independent of its maximum size. Prospective studies are warranted.

The aspect ratio (dome/neck) of XXXX .

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity75 :: ('MESH:D001927', 'Disease') :: ['ruptured and unruptured lesions', 'ruptured lesions'] @entity439 :: ('MESH:D000783', 'Disease') :: ['aneurysms', 'aneurysm', 'unruptured aneurysms'] @entity397 :: ('MESH:D012421', 'Disease') :: ['rupture'] @entity1756 :: ('MESH:D017542', 'Disease') :: ['ruptured aneurysms', 'ruptured and unruptured aneurysms']
@entity1756 :: (MESH:D017542,Disease) :: ['ruptured and unruptured aneurysms']
