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Radiology, Vol 194, 393-398, Copyright © 1995 by Radiological Society of North America

ARTICLES

Pulmonary nodules: CT evaluation of enhancement with iodinated contrast material

SJ Swensen, LR Brown, TV Colby and AL Weaver
Department of Diagnostic Radiology, Mayo Clinic, Rochester, MN 55905.

PURPOSE: To determine if the degree of enhancement of pulmonary nodules is directly related to the likelihood of malignancy and to the vascularity of the nodule. MATERIALS AND METHODS: Uncalcified 6-40-mm- diameter pulmonary nodules were studied in 163 patients with malignant neoplasm (n = 111), granuloma (n = 43), and benign neoplasm (n = 9). Serial thin-section computed tomography (CT) was performed before and after injection of 100 mL of nonionic contrast material at 2 mL/sec. The maximum level of enhancement was recorded. Eighteen histologic specimens were graded after vascular staining. RESULTS: Malignant neoplasms enhanced (median, 40.0 HU; range, 20-108 HU) significantly more than granulomas and benign neoplasms (median, 12.0 HU; range, -4 to 58 HU) (P < .001). With 20 HU as the threshold for a positive test, sensitivity was 100%; specificity, 76.9%; positive predictive value, 90.2%; negative predictive value, 100%; and accuracy, 92.6% (prevalence of malignancy, 68.1%). Degree of enhancement was significantly related to amount of central vascular staining (P = .003). CONCLUSION: Enhancement is an indicator of malignancy and vascularity.


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