[A case of perforation of the metastatic site of lung carcinoma in the small bowel].

Metastasis of lung carcinoma in the small bowel is so extremely rare as there were 53 cases in total with small bowel metastasis from lung carcinoma reported in the past literature. A case of a 72-year-old man with unresectable lung carcinoma (squamous cell carcinoma) was reported, he had an acute perforation of the small bowel following intensive course of irradiation therapy for primary site. Emergency operation was performed, but he died of DIC (disseminated intravascular coagulation) 3 days after surgery.