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The Sonographic Subcentimeter Malignant Thyroid Nodule: What Does It Stand for?
American Surgeon 2018 January 2
Thyroid cancer management has moved to less extensive surgery in lesions with favorable criteria. Our study evaluated if the sonographic (US) size of thyroid nodules is a reliable criterion to determine the extent of surgery in patients with papillary thyroid carcinoma (PTC). A retrospective study was performed to evaluate thyroid nodules measuring <10 mm in the preop sonogram with a permanent pathology of PTC. Patients were subdivided into two groups based on the US size: A (1-5 mm) and B (6-10 mm). Statistical correlations were made for the presence of the following unfavorable criteria: multifocality, capsular invasion, angio/lymphatic invasion, extrathyroidal invasion, and presence of metastases. A total of 1901 thyroidectomies were performed: 722 (38%) for PTC. 182 (25%) patients met the inclusion criteria. There were 30 patients in Group A (1-5 mm) and 152 patients in Group B (6-10 mm). Five (17%) patients in Group A and 53 (35%) patients in Group B presented unfavorable criteria (P < 0.005). Malignant thyroid nodules with the US size of <5 mm can in theory be candidates for partial thyroidectomy, but 17 per cent of them might still need further surgical intervention. Lesions with the US size of 6 to 10 mm still have a moderate risk of presenting unfavorable pathological criteria.
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