In these chronic pneumonitis cases,the borders of lesions were depressire or straight without hilar mass and obstructed bronchus.

• 慢性肺段肺炎病灶边缘多稍内凹或平直,楔尖支气管通畅,未见结节;密度较均匀,可见支气管气像或支扩;底部相邻胸膜增厚明显。