Purpose: Fine needle aspiration cytology (FNAC) is a very useful procedure for the diagnosis and management of thyroid disease. The use of FNAC has increased over the years. We determined the incidence of complications associated with ultrasound-guided FNAC using an extended tube for a thyroid mass and the factors that contribute to such complications. Methods: A retrospective chart review was conducted to identify patients who underwent FNAC. Two hundred fifty-four patients underwent 325 procedures between July and September 2009. Results: There were no major complications associated with ultrasound-guided FNAC using an extended tube for a thyroid mass. The most minor complication was neck pain, which occurred in 16.1% of the patients (41/254). Multiple FNACs, anti-coagulant medications, abnormal thyroid function tests, nature of the mass, and size of the mass did not contribute to the complications in this study. Conclusion: Using an extended tube during ultrasoundguided FNAC for a thyroid mass is safe and convenient. 2) 연구 방법(1) 세침 흡인 검사 방법: 환자를 누운 자세에서 어깨 밑

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