Barozzi L, Gavelli G P, Pavlica P, Stasi G, Viglietta G, Zompatori M
Radiol Med. 1986 Jul-Aug;72(7-8):539-47.
Rounded atelectasis is an uncommon but increasingly recognized form of pulmonary collapse that often mimics a pulmonary neoplasm. It is suggested that these lesions can occur many years after exposure to asbestos or exudative pleural effusions. The authors report 16 cases of rounded atelectasis seen during a period of over 10 years, 9 of which in the last 18 months. They describe the plain film, tomographic and CT appearances of the lesion. The radiographic features that allow a diagnosis are rounded or oval shadows lying along the posterior surface of the lower lobe, adjacent to thickened pleura. Lateral tomography and CT show the blood vessels and bronchi curving toward the mass and converging on one edge, like a comet tail. Differentiation of rounded atelectasis from neoplastic disease is essential in avoiding unnecessary thoracotomy.
圆形肺不张是一种少见但越来越被认识到的肺萎陷形式，常酷似肺部肿瘤。有观点认为，这些病变可在接触石棉或渗出性胸腔积液多年后出现。作者报告了10多年间所见的16例圆形肺不张病例，其中9例是在过去18个月内发现的。他们描述了该病变的平片、断层扫描和CT表现。有助于诊断的影像学特征为沿下叶后表面、与增厚胸膜相邻的圆形或椭圆形阴影。侧位断层扫描和CT显示血管和支气管向肿块弯曲并在一侧边缘汇聚，形似彗尾。将圆形肺不张与肿瘤性疾病区分开来对于避免不必要的开胸手术至关重要。
