At annual repeat CT screening, the finding of an isolated cystic airspace with increased wall thickness should raise the suspicion of lung cancer.

191. The observers examined each hemithorax image for these radiographic features. Also, each observer predicted the presence or absence of pleural fluid on the basis of the combination of signs present in each case, and evaluated the effusions as small, moderate, or large. Disagreements between observers were resolved by another review of the radiographs and mutual consensus. In most cases, disagreements resulted from quantification differences. The observers did not know the results of previous radioDownloaded from www.ajronline.org by 54.245.13.81 on 05/12/18 from IP address 54.245.13.81.

Address reprint requests to W. J. Dodds.

A study comparing precontrast and survey postcontrast dynamic computed tomographic (CT) scanning was performed on 60 patients who had suspected hepatic metastases. An incremental dynamic technique was used during and following a 50-g iodine load administered over two minutes. The survey postcontrast dynamic technique was superior in both sensitivity and contrast differentiation and yielded no known false-negative examinations. No postprocedure renal dysfunction was observed. High-dose contrast-material delivery in conjunction with incremental dynamic CT scanning appears to be the most suitable technique for performing postcontrast hepatic CT examinations.

No abstract