A case of ileocolic intussusception from renal cell carcinoma.

We report a case of ileal metastasis of renal cell carcinoma (RCC) in a 58-year-old male. The patient had a history of radical nephrectomy for a right RCC, and 2 years later underwent bilateral partial pneumonectomy for metastatic disease of the lung. A period of 1 year after the partial pneumonectomy, he developed bloody stools. Colonoscopy revealed an ileocolic intussusception caused by a polypoid tumor in the ileum, and the tumor was observed to be protruding into the ascending colon. The histological features of the tumor biopsy specimen confirmed the diagnosis of metastatic RCC. Metastasis of RCC in the small bowel is a rare disease clinically. To our knowledge, this is the first reported case with ileal metastasis of RCC, which has been definitively diagnosed by colonoscopy.