Dynamic Incremental Computed Tomography in Evaluation of the Pulmonary Hila

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Abstract
Contrast-enhanced dynamic computed tomography (CT) with table incrementation between scans was used to evaluate the hila in 100 patients without hilar abnormality and 15 patients with hilar pathology. This method of hilar evaluation was superior to conventional CT because hilar vascular structures could be clearly opacified. Opacification of normal hilar vessels permitted accurate detection of hypovascular hilar masses, some of which were very small, nonlobular and invisible using conventional CT. The technique was aslo useful in evaluating the hila in patients with pulmonary artery dilatation or pulmonary opacification contiguous with hilar borders. Contrast-enhanced dynamic incremental CT should be used for hilar investigation in patients referred for hilar CT examinations unless there is a specific contraindication to contrast medium administration.

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