A 72-year-old man was admitted to the hospital because of right lower abdominal pain on December 3, 2002. Plain abdominal X-ray film showed dilatation of the intestine and niveau, and abdominal CT scan on admission revealed the wall thickening and a foreign body of the ileum. At that time, we could not diagnose the ingested foreign body. On the 4th hospital day, follow-up CT scan showed that the foreign body had a small round nodule in the center and a high density area in the neighborhood. So we diagnosed the case as ileus due to ingested PTP, and performed emergency laparotomy on December 6. Intraoperative findings revealed inflammatory adhesions in the ileum 30 cm adoral to the end of the ileum, and partial resection of the small bowel was performed. The resected specimen contained Meckel's diverticulum covered by PTP. It was etiologically thought that the ingested PTP penetrated the opening of the Meckel's diverticulum causing inflammatory adhesions and evertual ileus. Preoperative diagnosis of accidentally swallowed PTP is often difficult, but abdominal CT scan is useful for diagnosis.