甲状腺结节超声特征对甲状腺癌的诊断准确性分析

The Change of Grammatical Sememe of ＂zai＂ in the Process of Grammaticalization

目的评价甲状腺结节超声特征在甲状腺癌诊断中的准确性。方法回顾分析228例患者甲状腺可疑结节的超声特征,包括结节大小、边界、回声、结节后方回声衰减、声晕、结节内钙化、结节纵横比、结节内部及周边血流、同侧颈部异常淋巴结等,并与穿刺病理结果比较,计算每一个超声特征的特异性、敏感性、阳性预测值及阴性预测值。结果 228例患者共检出甲状腺可疑结节267个,有18例发现颈部淋巴结转移。甲状腺良恶性结节在发病年龄及结节最大径方面比较差异无统计学意义,在性别及其他各项甲状腺结节特征方面比较差异均有统计学意义（均P〈0.05）。结论超声各参数诊断甲状腺癌的阳性预测值以结节纵横比≥1、结节后方回声衰减及结节内钙化最高。

The grammatical sememe is in the micro semantic construction of the word that can be grammaticalized. It is a sememe that can be categorized, whose change defines grammatical sememe. Chinese word ＂zai＂ means ＂exist＂ as a verb so the core sememe of this meaning has been kept in the meaning set when it is a preposition, adverb, and auxiliary word. By analyzing the change of grammatical sememe in various semantic structures,it at- tempts to provide deep semantic evidence for the generation of grammatical function and also semantic explanation for the blur boundary issue of this type of word.