[Pulmonary Enteric Adenocarcinoma Congenital Pericardial Defect Incidentally Discovered During Lung Cancer Surgery].

Pulmonary enteric adenocarcinoma is a rare subtype of adenocarcinoma that was introduced in the 2015 World Health Organization( WHO) Histological Classification and Lung Cancer Treatment Protocol (8th Edition). Distinguishing it from lung metastases of colorectal cancer poses a significant clinical challenge. We report three cases of pulmonary enteric adenocarcinoma with distinct computed tomography(CT) findings. Pulmonary enteric adenocarcinoma typically presents as a large mass, often characterized as substantial and lacking a significant ground glass shadow. However, in the first case, a partially filled nodular shadow was observed;in the second case, a well-difined cystic-like mass shadow was identified;and in the third case, a nodular shadow with an internal cavity was noted.