Real-time ultrasound elastography--a noninvasive diagnostic procedure for evaluating dominant thyroid nodules.

Langenbeck's Archives of Surgery
Christian VorländerRobert A Wahl

Abstract

Ultrasound elastography (USE) is a newly developed technique for the evaluation of tissue stiffness. It is known that malignancies often show a low-strain value. So far, only limited data for thyroid nodules is available. This study included 309 prospective evaluated patients with dominant, nontoxic thyroid nodules. All patients were referred to surgery. USE was performed preoperatively. Three measuring groups were formed: hard (< 0.15), intermediate (0.16-0.3), and soft (> 0.31). The measurements were correlated to the final histological findings. The strain rated from 0.01 to 0.84 (mean 0.26 ± 0.13). A total of 50 thyroid malignancies (35 papillara carcinoma, 9 medullary carcinoma, and 6 follicular carcinoma) were observed. Patients (81) were within the hard group, 35 of them (43.2%) had thyroid cancer (TC) in final histology. Out of 132 patients in the intermediate group, 15 patients had TC (11.4%). All 96 patients from the soft group showed benign histological results (NPV 100%). Seventy percent of patients with TC were within the hard group (PPV 42%). These results were highly significant (p < 0.001). Coarse calcifications and cystic nodules were not connected with reliable measurements and therefore are not suitable for U...Continue Reading

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