Objective: The use of Fine Needle Aspiration Cytology (FNAC) in the investigation of goitres was introduced into our practice more than a decade ago. This is a review of its diagnostic accuracy for thyroid carcinoma seven years after the first evaluation and following the establishment of the 'FNAC Clinic'.
Method: This is a retrospective study of patients who had FNAC of goitres and the histopathology of their thyroidectomy specimens between 1995 and 2004. The accuracy of the cytology reports were evaluated against the histology reports. The turnaround time of the patients for surgery was also determined.
Results: There were 130 females and 21 males with an age range of 7-86 years. The diagnostic accuracy of the procedure for carcinoma was 89% with a sensitivity of 35%, specificity of 97%, positive predictive value of 64%, and a negative predictive value of 91%. The average turnaround time for surgery was 178.7 +/- 248.7 days with a range of five days to three and a half years.
Conclusion: The diagnostic accuracy of FNAC of goitre for carcinoma improved in the period under review. However, the long surgery turnaround time may reduce the usefulness of the procedure. The accuracy may be improved further by a protocol of ultrasound guidance, capillary collection with no-aspiration technique, on-site review of slides with a repeat of FNA as necessary.
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