Abstract
A 77-year-old man visited our hospital with abdominal pain. A chest CT scan revealed a 7-cm diameter mass in the right lung and an abdominal CT scan showed intussusception with a tumor in the lead in the sigmoid colon. We diagnosed the case as intussusception of the sigmoid colon and metastatic cancer of the lung, and performed sigmoid colectomy and biopsy of the lung tumor. The resected specimen was a type I tumor sized 45×45×40 mm in dimension. Immunohistochemical analysis yielded positive results for cytokeratin (CK) 7 and thyroid transcription factor-1(TTF-1), and a negative result for CK20. Intussusception caused by colonic metastasis of lung cancer was finally diagnosed. As intussusception caused by colonic metastasis of lung cancer is rare, we present our case with a review of the literature.
