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【单选题】
患者，男，30岁，胸部不适，肺通气显像正常，肺灌注显像可见右肺上段、右肺中叶、右肺下、后基底段、左肺上叶尖后前段、左肺下叶显像剂分布不均匀性稀疏改变，考虑可能为A.
肺动脉栓塞
B.
肺部感染
C.
肺部肿瘤
D.
肺水肿
E.
肺气肿
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