A case of small cell lung carcinoma with esophagogastric metastasis

The patient was a 64-year-old man who visited his local doctor with the chief complaint of upper abdominal pain. Upper gastrointestinal endoscopy revealed elevated lesions in the middle thoracic esophagus and gastric cardia, and the patient was referred to our hospital. A biopsy was performed at our hospital, and immunostaining tests were positive for CD56, Synaptophysin, and Chromogranin, leading to a diagnosis of small cell carcinoma. The tumor was also strongly positive for TTF-1, confirming it originated from lung cancer. In this case, we diagnosed esophagogastric metastasis from a pulmonary primary tumor by immunostaining. Here, we report this case along with a literature review.