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[Correlation between computed tomographic vascular convergence sign and enhancement value in patients with pulmonary
Zeng Xiong1, Hui Zhou, Cheng-ping Hu2
1Department of Radiology, Xiangya Hospital, Central South University, Changsha 410008, China.
Objective:
To explore the correlation between computed tomographic (CT) vascular convergence sign and enhancement value in patients with pulmonary nodules.
Methods:
A total of 708 consecutive patients with pulmonary nodule received dual-source CT scan from January 2010 to January 2012. They were divided into vascular convergence sign group (including 4 subgroups) and non-vascular convergence sign group. Then the correlation between CT vascular convergence sign and enhancement values was analyzed.
Results:
The enhancement values in vascular convergence sign group were significantly higher than those in non-vascular convergence sign group ((27.6 ± 10.5) vs (3.2 ± 2.8) HU, P = 0.000). The CT enhancement values in lesions tended to increase with the number of connecting blood vessels. However, no significant differences existed among the subgroups (P > 0.05). The accuracy of vascular convergence sign for detection of pulmonary malignant nodules was 84.9%, 70.6% and 60.3% according to the standards of CT enhancement values ≥ 15, 20, 25 HU respectively. The sensibility, specificity and accuracy of determining pulmonary malignant nodules were 97.2%, 68.8% and 93.7% according to the standard of vascular convergence sign. The accuracy of determining pulmonary nodules' CT enhancement values ≥ 15 HU was 88.1% according to the standard of vascular convergence sign.
Conclusion:
Vascular convergence sign may be used to indicate the enhancement of pulmonary nodules when CT enhancement images are not available.
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