Small J H, Flower C D, Traill Z C, Gleeson F V
Department of Radiology, Addenbrooke's Hospital, Cambridge, UK.
Clin Radiol. 1996 Oct;51(10):684-8. doi: 10.1016/s0009-9260(96)80238-8.
To document the phenomenon and distribution of air-trapping on computed tomography in patients with sub-acute extrinsic allergic alveolitis (EAA).
A retrospective analysis of high resolution CT scans was performed on 20 patients with proven EAA. All patients had inspiratory scans and 12 patients had expiratory scans. These were assessed for the presence and distribution of: air-trapping, ground-glass opacification and nodularity.
Areas of decreased attenuation consistent with small airways disease was demonstrated in 15/20 patients on inspiratory scans, and confirmed to be areas of air-trapping in 11/12 patients on expiratory scans. Additional areas of air-trapping were identified in 5/11 patients on expiratory scans. 18/20 patients had found-glass opacification and 14/20 patients demonstrated a nodular patter.
Air-trapping is a common finding in sub-acute extrinsic allergic alveolitis on CT and its detection is enhanced by performing expiratory scans.
记录亚急性外源性过敏性肺泡炎（EAA）患者在计算机断层扫描上空气潴留的现象及分布情况。
对20例确诊为EAA的患者进行高分辨率CT扫描的回顾性分析。所有患者均进行了吸气扫描，12例患者进行了呼气扫描。评估了以下情况的存在及分布：空气潴留、磨玻璃样混浊和结节状改变。
在吸气扫描中，15/20例患者显示出与小气道疾病相符的衰减降低区域，在呼气扫描中，11/12例患者证实这些区域为空气潴留区域。在呼气扫描中，5/11例患者发现了额外的空气潴留区域。18/20例患者有磨玻璃样混浊，14/20例患者呈现结节状表现。
空气潴留是亚急性外源性过敏性肺泡炎CT上的常见表现，通过进行呼气扫描可提高其检出率。
