细支气管肺泡癌 (ＢＡＣ) ,是一种特殊类型的原发性支气管肺癌 ,在ＷＨＯ分类法中属于腺癌的一个亚型 ,其发生率约占肺原发肿瘤的 2 %～ 2 1% [1,2 ] 。因其缺乏典型的临床症状和影像学表现 ,极易误诊 ,尤其是弥漫性细支气管肺泡癌 (ＤＢＡＣ)误诊率更高。分析我院近年来收治的 Bronchoalveolar carcinoma (BAC), a special type of primary bronchogenic carcinoma, is a subtype of adenocarcinoma in the WHO classification and accounts for about 2% to 21% of primary lung tumors [ 1,2]. Because of its lack of typical clinical symptoms and imaging findings, easily misdiagnosed, especially diffuse bronchioloalveolar carcinoma (DBAC) misdiagnosis rate is higher. Analysis of our hospital admitted in recent years