Considerations upon a case of synchronous primary malignancies: adenocarcinoma of the sigmoid and clear cell carcinoma of the right kidney.

Synchronous primary colon and renal cancer is a rare but real clinical entity reported with variable incidence. An 81-year-old man admitted for abdominal pain and melena is diagnosed with right colic tumor by colonoscopy and with simultaneous right kidney tumor by CT-scan. The patient is adequately prepared and scheduled for laparotomy.