CT Analysis of Solitary Thyroid Cystic Lesions:A Report of 48 Cases

Objective To study the CT findings and differential diagnosis of solitary thyroid cystic lesions.Methods 48 cases of solitary thyroid cystic lesions confirmed pathologically were analysed retrospectively.Results According to the CT findings,the lesions could be divided into there types:type Ⅰ simple cyst(n=35),type Ⅱ cyst with nodule on the wall(n=4) and type Ⅲ cyst with thick wall and/or round mass on it(n=9).The enhanced ring appeared in thyroid adenomas was complete(n=25) in comparison with the enhanced ring was fragmentary appeared in thyroid carcinoma(n=2),double circle enhanced ring appeared in abscess(n=2).Type Ⅰ more common appeared in benign lesions(35/35) in comparison with type Ⅱ in malignant lesions(7/9)(P0.01).Conclusion (1)The complete enhanced ring on CT scan is the characteristic of thyroid adenomas;(2)Double circle enhanced is the characteristic of thyroid abscess;(3)Type Ⅰ is common seen in benign lesions,while type Ⅲ is common seen in thyroid carcinoma.