Transversal CT images of pulmonary adenocarcinoma with examples of the morphological features under investigation.

<p>(A) Central lesion with tumor-bearing lobe atelectasis; (B) peripheral cavitary solid mass with ovoid shape, predominant spiculated margins and associated pleural tags (arrow); (C) central irregular semi-solid lesion in smooth margin with air bronchogram (arrow), GGO account for 25%-50%; (D) peripheral lesion with irregular shape, air bronchogram (arrow) and pleural tag (arrowhead); (E) central solid lesion with irregular shape and predominant lobulated margins with bilateral pulmonary metastases (arrows); (F) Irregular shape tumor after contrast enhancement showed central necrosis (arrow) and contralateral mediastinal lymph node metastasis (arrowhead); (G) tumor-side pleural metastases (arrows); (H) liver, bone, and bilateral adrenal gland metastases (arrows).</p>