Enteric intussusception due to metastatic intestinal tumors.

Enteroenteric intussusception caused by metastatic tumors is a very rare condition. Because of its rarity and rather mild abdominal physical presentation, preoperative diagnosis is not easily made. Two cases of enteric intussusception due to metastatic intestinal tumors, with the main symptom of melena, are reported. Intussusception was caused by metastatic liposarcoma in one patient and metastatic melanoma in the other. Both patients had long histories of malignant disease, for 15 and 8 years, respectively. They had undergone repeated surgical treatment for metastatic lesions. The diagnosis of enteric intussusception was initially made by computed tomographic scans and small bowel series and was confirmed by laparotomy and pathologic findings. We suggest that tumor metastasis to the small intestine with intussusception should be considered in patients with recurrent tumors and tarry stools.