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Abstract: Poster Presentations |

CT ASSESSMENT OF THE POSTERIOR JUNCTION LINE AND ITS ASSOCIATION WITH EMPHYSEMA FREE TO VIEW

Gina M. Zarrilli, DO*; William H. Moore, MD; Daniel Baram, MD
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Stony Brook University Medical Center, Stony Brook, NY


Chest


Chest. 2007;132(4_MeetingAbstracts):523b. doi:10.1378/chest.132.4_MeetingAbstracts.523b
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Abstract

PURPOSE: Visualization of a posterior junction line on chest x-ray is evidence for emphysema. The correlation between a CT posterior junction line and emphysema is less clear.

METHODS: 137 patients were identified with CT and PFT's performed within 3 months in a University hospital. The posterior junction line was measured at 2 levels by a blinded investigator. The width of the line was correlated to CT evidence of emphysema and with clinical and PFT data.

RESULTS: The posterior junction line was only weakly correlated to CT emphysema severity scoring (r2 = −0.25, p<0.01). Narrower junction line showed little correlation with PFT evidence of emphysema as assessed by FEV1/FVC ratio (r = 0.08) and DLCO percent predicted (r = 0.14). The ROC curve for posterior junction line width for the diagnosis of emphysema was only 0.73, with a maximum accuracy at 1.2 cm.

CONCLUSION: Our data suggests that there is only weak statistical correlation between the posterior junction line and emphysema and it should not be considered clinically useful.

CLINICAL IMPLICATIONS: Though a posterior junction line on CXR is stongly indicative of emphysema, visualization of a PJL on CT should not be taken as evidence of hyperinflation or airflow obstruction. Standard CT criteria for emphysema is more sensitive and specific.

DISCLOSURE: Gina Zarrilli, No Financial Disclosure Information; No Product/Research Disclosure Information

Wednesday, October 24, 2007

12:30 PM - 2:00 PM


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