Abstract：Objective: To evaluate the value of dynamic enhanced CT in differential diagnosis of solitary pulmonary nodules. Material and Methods: Forty-two cases of SPN collected in this study all accepted dynamic enhanced CT scanning. The enhancement pattern included no enhancement, ring enhancement, homogeneous and heterogeneous enhancement. The CT values of SPNs on pre- and post-enhanced images were measured. The dynamic curves for different kinds of lesions were described, respectively. Results: Eighteen cases of lung cancer demonstrated homogeneous enhancement, 2 cases of whom showed spot vascular enhancement, 7 cases heterogeneous enhancement. Eight cases of inflammatory nodules(8/10) showed homogeneous enhancement, 2 cases ring enhancement. Five cases of tuberculosis(5/7) demonstrated no enhancement, 2 cases rim enhancement. Peak heights of lung carcinoma and inflammatory nodules were significantly higher than that of tuberculosis(P<0.001; P<0.01). The dynamic curve of malignant SPNs showed a slowly progress, rapidly progress and then decreased slowly; Inflammatory nodules showed a rapidly increase, slowly decrease and then increase again; The curve for tuberculosis was a very low and smooth pattern. The durations of reaching peak height of malignant and inflammatory nodules were 39s and 36s after injection of contrast media, respectively. Conclusions: Dynamic enhanced CT can supply much more information about dynamic enhancement of SPNs. It possesses the important value in improving the qualitative diagnostic accuracy.
2008, Vol. 19 
