Posters. P17 Accuracy of fine needle aspiration cytology in diagnosis of thyroid swellings

Introduction  Fine needle aspiration cytology is regarded as the gold standard investigation in diagnosis of thyroid swellings. Published data suggest an overall accuracy rate of 75%1 in the detection of thyroid malignancy. The aim of this study was to determine the accuracy of FNA cytology in detection of thyroid malignancy in our surgical unit.Methods  Between 1989–2002, 144 patients who underwent thyroid resection by single consultant surgeon and who had pre‐operative FNA were enrolled in this retrospective study. The pre‐operative FNA results were compared with definitive histological diagnosis following thyroid resection. Fine needle aspiration cytology was performed using aspirate and non‐aspirate techniques on each thyroid swelling. The cytological sample was assessed by a single cytopathologist and was classified as inadequate, non‐neoplastic, neoplastic, suspicious or indeterminate. The histology was classified as non‐neoplastic (benign) and neoplastic (malignant).Results  Fine needle aspiration cytology analysis revealed 94 (13.88%) non‐neoplastic, six (65.27%) neoplastic and 20 (4.16%) suspicious aspirates. Twenty (13.88%) samples were inadequate and four (2.77%) samples were indeterminate. Histological analysis showed 118 (81.94%) benign, 26 (18.05%) malignant specimens. Fine needle aspiration cytology had a sensitivity, specificity and accuracy rate of 52.6%, 86.6% and 79.1%, respectively for diagnosing thyroid malignancy.Conclusion  The results are comparable with the current published data and demonstrate that FNA cytology in our hands is accurate investigation for pre‐operative diagnosis for the detection of thyroid malignancy.