碰撞瘤属于临床罕见病,目前研究报道较少,其可发生在口腔、食管-胃交界处、肝脏-胆管、肺、子宫、直肠肛门交界和膀胱等处[1]。有关肺碰撞瘤的研究报道更少见,尚无其发病率的统计,其发生机制尚不明确,临床工作中常常因对该病的认识不足、分类混乱而导致误诊、漏诊。随着近年文献报道的 Collision tumor is a rare clinical disease, the current study reported less, which may occur in the mouth, esophageal-gastric junction, the liver - bile duct, lung, uterus, anorectal junction and bladder and other places [1]. There is no report on the incidence of pulmonary tumor. There is no statistics on its incidence yet. The mechanism of its occurrence is not yet clear. In clinical practice, it often leads to misdiagnosis and misdiagnosis due to the lack of understanding of the disease. As reported in recent years