婴幼儿甲状舌管囊肿的CT诊断(附23例分析)

CT diagnosis for thyroglossal duct cyst of infants: analysis of 23 cases

目的 探讨婴幼儿甲状舌管囊肿的CT表现。方法 对 2 3例手术和病理证实的婴幼儿甲状舌管囊肿进行回顾分析。结果 CT表现为颈前正中圆形或椭圆形囊肿 18例 ,偏一侧者 5例 ;6例与舌骨直接关联 ;17例与甲状腺直接关联。CT平扫囊肿呈低密度 15例 ,等密度 8例。 14例增强扫描囊内均无强化 ,其中 11例囊壁有强化。全部病例未见钙化、瘘管及囊肿向喉内延伸。结论 婴幼儿甲状舌管囊肿的CT表现具有特征性 ,可为临床提供明确诊断。

Objective To investigate the CT features of thyroglossal duct cyst (TDC) in infants. Methods CT, surgical and pathological findings in 23 infants (the age ranged from 1 month to 3 years; mean age 2.2 years) with TDC were reviewed. The size, shape, and site of the cysts, the relationship of the cyst to ossa hyoideum and thyroid gland, the density definition margins, and enhancement of cyst were evaluated. Results In CT features, 18 of the 23 cases were located at midline of the neck and the other 5 cases deviated aside. 6 of 23 cases were directly related to the ossa hyoideum and 17 of 23 cases were directly related to thyroid gland. All TDC appeared as a round or ovary shape with saccular low density (15 cases) or iso attenuating mass(8 cases).No enhancement was detected within the cysts after intravenous contrast media administration in 14 cases, but enhancement of the wall was present in 11 cases (11/14). Calcification, fistula, or intralaryngeal extension of TDC were not found. Conclusion TDC in infants was typically a non enhanced homogeneous low attenuating cyst with enhancement of the cyst wall on CT, and TDC can be diagnosed correctly by CT.