3厘米以下孤立性肺结节胸膜凹陷征的CT评价

CT Evaluation of Pleural Indentation of Solitary Pulmonary Nodules Less Than 3 cm.

本文复习了经手术病理证实的3cm 以下孤立性肺结节的CT 影像40例(周圈性小肺癌30例、肺良性小结节10例)。结果显示胸膜凹陷征阳性率在小肺癌为66.7%,良性结节为70%,两者相近.此征象阳性的结节一胸壁间距平均6.8mm,而无此征象的结节一胸壁间距平均15mm,有胸膜凹陷者的结节一胸壁间距比无此征象者明显小。CT 一病理对照显示肺内小结节纤维组织增生与胸膜凹陷征的形成关系密切.此征象的形成与肺内结节的良、恶性关系不大.作者认为CT 像上单纯的胸膜凹陷征对周围型小肺癌与良性小结节鉴别诊断的价值不大.

To evaluate the pleural indentation sign(PISs)of solitary pulmonary nodules less than3cm.We studied the CT images of 40 smallsolitary pulmonary nodules(30 lung cancersand 10 benign nodules).On thin-section CTimages,the PISs of lung cancers were found in20(66.7%)and PSSs of benign nodules in 7(70%).The average distance of noduleparietalpleura of the cases with PIS was 6.8mm andthat of the cases without PIS was 15mm on CTimages.There was a close relation between theformation of PIS and the fibrosis of nodules bypathologic observation.We think that PIS is nota valuble sign in differential diagnosis betweenmalignancy and benignancy of small soltitarypulmonary nodules on CT image.