隐匿性甲状腺癌的超声诊断和误诊分析

目的:探讨隐匿性甲状腺癌(OCT)的超声特征和误诊原因.材料和方法:回顾性分析30例OCT及7例良性甲状腺小结节患者的超声图像,并与手术病理检查结果对照. 结果:37例甲状腺小结节病例中,病理检查证实OCT 30例共38个结节,声像图表现为实性低回声37个(97.4%),33个(86.8%)形态不规则,17个(44.7%)前后径/上下径(T/L)比值≥1,19个(50.0%)内部出现点状强回声,彩色多普勒血流显示不丰富36个(94.7%),28个(93.3%)血流阻力指数<0.7.超声检查误诊为OCT 7例,其中病理检查示慢性淋巴细胞性甲状腺炎伴结节形成3例、结节性甲状腺肿2例、胶原结节2例,其超声表现与OCT有混叠,有3例结节后方回声出现增强.结论:OCT的声像表现有较高特征性,有助于临床对OCT的诊断.但少数甲状腺良性小结节的超声表现与OCT有混叠,易引起误判,应引起重视.

The Diagnosis and Pitfalls of Ultrasonography in the Occult Carcinoma of Thyroid

Purpose:Occult carcinoma of thyroid ( OCT) is difficult to differentiate from benign thyroid nodules because it is small ( < 1 cm),often asymptomatic,shares similar ultrasonographic characteristics.The aim of this study was to retrospectively review the ultrasound diagnosis and pitfalls of ultrasound in OCT.Materials and Methods: The ultrasonography in 37 cases suspected of OCT were reviewed,analyzed and compared with histopathology.Results: 30/37 (81.1% ) cases (38 nodules) confirmed of OCT were found solid,hypoechogenic nodules in 97.4%,with irregular margins ( 33/38,86.8% ),longitudinal-to-transverse ratio = 1 ( 17/38,44.4% ),minute calcification (19/38,50.0%),decreased flow (36/38,94.7%),and resistance index < 0.7( 30/37,81.1%).7/37 (19.0%) cases of misdiag-nosis included 3 chronic lymphocytic thyroiditis with nodules,2 nodular goiter and 2 collagen nodules.They all had overlapping ultrasonographic features.Conclusion: Those ultrasonographic features were of certain value in OCT.