METHODS	Each lesion was evaluated for ( 1 ) the presence or absence of globular enhancement ( defined as enhancing nodules less than 1 cm seen within a lesion ) , ( 2 ) the density of globular enhancement relative to that of the aorta , ( 3 ) the degree of border definition ( well or poorly marginated ) , and ( 4 ) the presence or absence of a hypodense halo .\