Metastatic renal cell carcinoma involving the rectum

Metastatic spread of a distant tumor to the rectum is extremely rare. To our knowledge, there have been no published reports of hematogenic metastasis from a renal cell carcinoma to the rectum. A patient with a renal cell carcinoma was initially treated by a radical right nephrectomy. Nine months after the surgery he started to have multiple episodes of hematochezia. Colonoscopy showed a nodular lesion located in the distal rectum, and biopsy revealed an undifferentiated carcinoma. The patient then underwent abdominoperineal resection of the rectum, and histological examination showed metastatic renal clear cell carcinoma. This case represents an exceedingly rare condition, which has never been reported before.