肺薄壁囊样转移瘤的CT诊断(附28例分析)

CT Diagnosis of Lung Cystiod Metastases with Thin-Wall (Analysis of 28 Cases)

目的 :研究肺薄壁囊样转移瘤的CT表现及形成机制。材料和方法 :在肺转移瘤病例中搜集 2 8例肺薄壁囊样转移瘤。其原发肿瘤为甲状腺 10例 ,肺 7例 ,鼻咽 3例 ,乳腺、腮腺、颊粘膜各 2例 ,组织来源不明 2例。全部病例均行CT平扫及增强扫描。结果 :左肺 11例 ,右肺 17例。病灶呈薄壁囊状 ,中心低密度 ,以圆形或类圆形居多 ,直径 0 .3～ 2cm之间。不同组织及脏器来源的转移瘤 ,CT表现相同。结论 :形成机制可能与肺转移瘤内所分泌粘液及肺泡破裂和终端支气管单向活瓣形成有关。CT检查对肺部薄壁囊样病灶的诊断与鉴别诊断具有重要的价值。

Purpose: To investigate CT manifestation and its foramative mechanism of lung cystiod Metastases with thin wall. Materials and Methods: There were 28 cases of lung cystiod metastases with thin wall , the primary lesions were thyroid gland(10cases), lung (7 cases), nasopharynx (3 cases), breast (2 cases), parotid gland (2 cases), cheek mucosa (2 cases) and unknowed positions (2 cases). Plain-and enhanced Scanning was carried out for all cases. Results: CT manifestation was characterized with thin wall,cystis shape, low density for all cases and round or roundlike ones as well as 0.3～2cm of diameter, regardless of primary position. Conclusion: The formative mechanism of CT manifestation from these metastases may be related to mucus from them, burst of pulmonary alveolus and active valve of terminal bronchus. CT examination is considered valuable for the diagnosis and differential diagnosis of cystoid lesion with thin wall.