Gastric metastasis by primary lung adenocarcinoma

Figure 1 Gastrointestinal endoscopy on admission showed Type 4 tumor spread from the gastric upper third of the stomach and body, with loss of distensibility of the gastric wall.

Figure 2 Hematoxylin and eosin staining of the specimen from the gastric tumor showed adenocarcinoma cells infiltrated in the gastric mucosa.

Figure 3 Chest CT on admission showed thickening of the gastric wall (A) and mass shadow in the right lung S¹⁰ segment (A and B).

Figure 4 Immunohistochemical staining of gastric cancer for Cytokeratin 7 (A) and TTF-1 (B) showed immunopositive staining for both markers.