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Diagnostic value of FNA in assessment of thyroid nodules Comparing cytology study with histology study

القيمة التشخيصية للرشافة بالإبرة الرفيعة في تقييم العقد الدرقية و مقارنة الدراسة الخلوية مع الدراسة النسيجية

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 Publication date 2018
  fields Medicine
and research's language is العربية
 Created by Shamra Editor




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Introduction : The main role of fine needle aspiration cytology (FNAC) lies in the differentiating between a malignant and benign thyroid nodule. It greatly influences the treatment decision. Aim : This study aimed to evaluate the accuracy of fine needle aspiration cytology (FNAC) in the diagnosis of thyroid nodules by evaluating the cytology–histopathology correlation . Materials and Methods : This is a prospective study of 49 diagnosed cases of thyroid nodules who underwent FNAC and histological study of surgical biopsies for diagnosis at Tishreen University Hospital , during the period between march 2017 – march 2018 .The results were categorized according to Betheseda classification into: insufficient for diagnosis, benign, follicular lesion of undetermined significance, follicular neoplasm, suspicious for malignancy, and malignant sampling. The final histologic diagnosis was considered the gold standard. Results : The study included 49 cases presented with thyroid nodules who underwent diagnostic thyroid FNAC. Female to male ratio was 7.2:1, and the mean age was 43.6 years. Thirty –nine cases (79.6%) were diagnosed as benign, 3 cases (6.1%) as unsatisfactory , 2 cases (4.1%) as follicular neoplasm, 2 cases (4.1%) as suspicious for malignancy, 2 cases (4.1%) as malignant, and 1 case (2%) as follicular lesion of undetermined significance. Nodular goitre represented the majority of benign cases (62.8%), while papillary carcinoma was the most frequent malignant lesion (83.3%). Cytologic diagnoses were compared with their corresponding final histologic ones. FNAC achieved a sensitivity of 83.3%, a specificity of 97.4%, a positive predictive value of 83.3%, a negative predictive value of 97.4%, a false positive rate of 2.5% , a false negative rate of 16.6% , and a total accuracy of 95.5%. Conclusion : FNA cytology is a sensitive, specific, and accurate initial diagnostic test for the evaluation of patients with thyroid nodules.

References used
ASCHEBROOK-KILFOY B, WARD MH, SABRA MM, DEVESA SS (2011) Thyroid cancer incidence patterns in the United States by histologic type, Thyroid 21: 1992-2006. 125-134
STANG MT, CARTY SE. Recent developments in predicting thyroid malignancy. Curr Opin Oncol. 21(1): 2009;11-17
YOON DY, CHANG SK, CHOI CS, et al. The prevalence and significance of incidental thyroid nodules identified on computed tomography. J Comput Assist Tomogr. 32(5): 2008;810-815
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