Abstract
Management of complex thyroid nodules (CTN) is a common dilemma due to their high prevalence and frequent nondiagnostic fine needle aspiration cytology (FNAC). In order to know the rate of malignancy, we reviewed our experience about histopathologic diagnosis of CTN with nondiagnostic FNAC, and we analyzed if cytological variants of nondiagnostic FNAC indicated different histopathologic outcomes. We conducted a review of 927 consecutive aspirations performed between 2003 and 2008. We selected patients without history of radiation, with echographic CTN, and nondiagnostic FNAC, who underwent surgery. We analyzed histopathologic results and compared patients with benign and malignant nodules, and searched for differences between patients with cystic changes in FNAC (C-FNAC), and patients with acellular or only bloody FNAC (A-FNAC). Thirty-six patients were included (mean age 45.7 ± 13 years; 30 females). Four patients had malignant nodules; all were papillary carcinomas. Patients with benign nodules had a similar profile to patients with malignant nodules. Patients with C-FNAC (n = 21) were younger (41.3 ± 12.6 vs. 51.8 ± 11.2 years; P < 0.02), had more lymphocytic thyroiditis (33.3 vs. 0%; P < 0.02), a slightly higher rate of carcinoma in the nodule (14.3 vs. 6.6%; P: ns), and also of papillary microcarcinoma outside the nodule (9.6 vs. 0%; P: ns) than patients with A-FNAC. In conclusion, we report an 11.1% malignancy rate in CTN with nondiagnostic FNAC. Nodules with C-FNAC variant had a slightly higher rate of malignancy than A-FNAC, which may be in relation with younger age and higher prevalence of lymphocytic thyroiditis in this group of patients.
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García-Pascual, L., Barahona, MJ., Balsells, M. et al. Complex thyroid nodules with nondiagnostic fine needle aspiration cytology: histopathologic outcomes and comparison of the cytologic variants (cystic vs. acellular). Endocr 39, 33–40 (2011). https://doi.org/10.1007/s12020-010-9409-2
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DOI: https://doi.org/10.1007/s12020-010-9409-2