Worthy S A, Brown M J, Müller N L
Department of Radiology, University of British Columbia and Vancouver Hospital and Health Sciences Centre, Canada.
Clin Radiol. 1998 Jul;53(7):515-9. doi: 10.1016/s0009-9260(98)80172-4.
To determine the presence of change in size of air-filled cysts in the lung on expiration by comparison between inspiratory and expiratory high-resolution computed tomography (CT) scans.
Inspiratory and expiratory high-resolution (1-mm collimation) CT scans were obtained in 23 patients with lung cysts due to a variety of lung diseases. The 23 patients had a total of 27 types of cystic lesions including bullae (n=7), honeycomb cysts due to fibrosing alveolitis (n=11), lymphangioleiomyomatosis (LAM, n=2), cystic adenomatoid malformation (n=1), and bronchiectasis (n=6). An adequate expiratory effort, with at least 5% decrease in the anteroposterior or transverse thoracic diameter, was required for inclusion in the study. Inspiratory and expiratory scans at corresponding anatomic levels were compared to determine any change in size of the cysts on expiration.
Cystic lesions due to bronchiectasis, LAM and fibrosing alveolitis decreased in size on expiratory CT. In six of seven cases bullae decreased in size, and in one patient with a single bulla it remained unchanged. In one case a single cyst due to cystic adenomatoid malformation increased in size on expiration.
The majority of lung cysts decrease in size on expiration suggesting that they communicate with the airways.
通过吸气和呼气高分辨率计算机断层扫描（CT）的比较，确定肺部含气囊肿在呼气时大小是否改变。
对23例因各种肺部疾病导致肺囊肿的患者进行吸气和呼气高分辨率（1毫米准直）CT扫描。这23例患者共有27种囊性病变，包括肺大疱（n = 7）、纤维化肺泡炎所致蜂窝状囊肿（n = 11）、淋巴管平滑肌瘤病（LAM，n = 2）、囊性腺瘤样畸形（n = 1）和支气管扩张（n = 6）。纳入研究要求有足够的呼气动作，前后径或横径至少减少5%。比较相应解剖层面的吸气和呼气扫描，以确定囊肿在呼气时大小的任何变化。
支气管扩张、LAM和纤维化肺泡炎所致的囊性病变在呼气CT上大小减小。7例肺大疱中有6例大小减小，1例单个肺大疱患者大小无变化。1例囊性腺瘤样畸形所致单个囊肿在呼气时大小增加。
大多数肺囊肿在呼气时大小减小，提示它们与气道相通。
