MRI可辨别肺癌放疗后纤维化抑或肿瘤复发，区分肺门癌块与阻塞性肺不张；
MRI could distinguish porstradiotherapy lung fibroid masses from carcinoma recurrence and pulmonary neoplasm from obstructive atelectasis.
结果发现2 3例患者粘稠痰液阻塞一侧主支气管或叶支气管，为阻塞性肺不张；
Results Unilateral bronchus or lobar bronchus was obstructed by thick sputum in 23 patients, where the atelectasis was obstructive.
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