Isodense masses on CT: differentiation by gray scale ultrasonography

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Abstract
Alterations in echo patterns enable isodense structures and lesions to be clearly identifiable by gray scale ultrasonography when they are not distinguishable by computed tomography (CT). In certain clinical situations this capability is a distinct advantage of ultrasound over CT. Findings in three cases with abnormalities visualized by ultrasound, but not by CT, are presented. In addition, a cadaver was scanned with CT and ultrasound and then sectioned in corresponding transverse planes for anatomic correlation.

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