CT所見が異なる腸型肺腺癌

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

腸型肺腺癌は2015年の世界保健機関（WHO）組織分類および『肺癌取扱い規約第8版』において肺腺癌の亜型として追加された，まれな腺癌の亜型である1）．大腸癌肺転移との鑑別が臨床的に問題となる．われわれはCT所見がまったく異なる腸型肺腺癌を3例経験したので報告する．

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.