Thyroid cytology and the risk of malignancy in thyroid nodules: importance of nuclear atypia in indeterminate specimens

Thyroid : Official Journal of the American Thyroid Association
A S KelmanR S Haber

Abstract

Fine needle aspiration (FNA) cytology is the best test for malignancy in thyroid nodules. However, cytologic interpretation of FNA specimens is often difficult, especially in the presence of indeterminate microfollicular cytologic patterns, which are thought to suggest follicular neoplasm (adenoma or carcinoma). To assess the risk of malignancy associated with specific cytologic patterns, we correlated preoperative FNA cytologic patterns (n = 484 reports including repeat aspirations) with final histological diagnoses for 368 surgical thyroid specimens obtained during the period 1994-1998. The overall prevalence of malignancy in the surgical specimens was 31% (113 cancers, including 96 papillary and 9 follicular carcinomas). For nodules with benign FNA cytologic diagnoses of nodular goiter and chronic thyroiditis there was a low risk of malignancy (6/99, or 6.1%). Nodules with indeterminate cytologic patterns in the absence of nuclear atypia (i.e., microfollicles without nuclear atypia) had a similarly low malignancy risk (3/46, or 6.5%). In contrast, 31/52 nodules with cytologic nuclear atypia consistent with follicular neoplasm were malignant (60%), including specimens with or without microfollicular cytology. Nodules with fra...Continue Reading

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