六、结论
甲状腺结节绝大部分属于良性病变，超声和FNAC是临床评估其性质、随访观察中最常用的方法。对经过超声和FNAC 鉴定为良性的结节，考虑到超声在随访中能有效筛查恶性变结节，可选择随访观察，并根据结节是否生长、是否出现可疑恶性征象进一步评估和治疗。在良性结节的临床处理中，应慎重考虑治疗的必要性，把握其适应证，避免过度医疗。
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