Thin-sliced CT Analysis in Relationship between Solitary Pulmonary Lesions and Surrounding Vessels.

概要

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In order to evaluate the relationship between peripheral pulmonary nodules (PPN) and the surrounding vessels, thin-sliced computed tomography was used to study 30 patients with PPN less than 20 mm in diameter. There were 16 patients with lung cancer (14 adenocarcinomas, 2 squamous cell carcinomas) and 14 patients with benign lesion (6 benign tumors, 2 pneumonias, 6 granulomas). Thin-sliced CT images were examined by an extended scale (window level:-600, window width: 1900). In those cases which were resected, surgical specimens were sliced transversely to correlate with the thinslice d CT images.<BR>In thin-sliced CT images, the relationship between PPN and surrounding vessels were classified into four types, PPN with no vascular association (type 1), PPN bordered laterally by vessels (type 2), PPN with vascular involvement (type 3), PPN penetrated by vessels (type 4). Type 3 or 4 was seen in all lung cancers, whereas type 1 or 2 was seen in benign lesions. Thus involvement or penetration by PPN of surrounding pulmonary veins is strongly suggestive of malignancy.<BR>Our results may suggest that thin-sliced CT findings may have a significant clinical role in differentiating peripheral small pulmonary lesion by demonstrating the relationship between lesions and the surrounding vessels.
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