Abstract
A 71-year-old man was referred to our hospital, after consulting at another institution for the chief complaint of dysphagia. Esophagography performed at the other institution indicated an esophageal tumor, and the patient was referred to our department for further examination. Subsequent endoscopy revealed a rounded type 3 tumor in the lower esophageal tract. A CT scan showed swelling in lymph nodes 1, 2, and 110 ; there was no distant metastasis. We diagnosed the patient with esophageal cancer (Lt type 3 T3N2M0, clinical Stage III) and performed subtotal esophagectomy by right thoracotomy, retrosternal gastric tube reconstruction, and 3 field lymph node dissection. Histopathological examination of the resected specimen revealed that the type 3 tumor actually consisted of 2 tumors. One was a type 3 tumor sized 5.3×5.2 cm, and the other was a 0-Ipl tumor sized 4.2×2.6cm. The 2 tumors were located adjacent to each other. The pathological diagnosis was esophageal collision cancer involving squamous cell carcinoma and neuroendocrine carcinoma. The patient is now undergoing adjuvant chemotherapy. Thus, we report an extremely rare case of collision cancer that was located in the esophageal tract.
