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

VernacularTitle:隐匿性甲状腺癌的超声诊断和误诊分析
Author: Ye HU ; Xiaoyu YU ; Jie LI
Publication Type:Journal Article
Keywords: diagnostic pitfall; thyroid nodule; thyroid Neoplasms; ultrasonography
From: Chinese Journal of Medical Imaging 2009;(6):409-411
CountryChina
Language:Chinese
Abstract: 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.