Abstract
Objective To probe the clinical diagnosis value of high frequency ultrasonography (HFUS) in thyroglossal duct cyst(TDC). Methods Forty-one TDC were taken HFUS and the location, boundary,shape,interal echo of lesions and the relation to hyoid bone were observed. The periphery and internal blood flow signal were detected by color Doppler flow imaging. The results of HFUS were compared with those of pathology after operation. The cases were divided into groups according to pathological types and were compared with acoustic image shows. Results All cases were diagnosed TDC by pathology after operation. Internal walls of 9 TDC consist of cilium columnar epithelium, 19 consist of stratified pavement epithelium and 13 consist of this two epitheliums. HFUS showed different pathological types had different ultrasonic appearances. In this study, 77.8%(7/9) TDC with columnar epithelium showed echoless,84.2 (16/19) TDC with pavement epithelium showed similar solid echopattern and TDC with two epitheliums mainly showed similar solid echopattern and multi-room cyst. Hyperechogenicity of hyoid bone displayed around the lesion in 80.5%(33/41)TDC. No blood flow signal showed in 41 TDC and a little punctiform blood flow signal showed in the periphery of 5 TDC. The diagnose accordance rate of HFUS in TDC was 95.1%(39/41). Conclusions HFUS can clearly show the location, boundary, shape,interal echo of TDC and its relation to hyoid bone. HFUS is important for diagnosis and differential diagnosis of TDC. Key words: Ultrasonography; Thyroglossal cyst
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