Recent literature suggests that pulmonary embolus secondary to renal cell carcinoma may by more common than previously suspected. Renal tumors are known for their ability to metastasize early, often before the primary lesion is apparent. A patient with renal cell carcinoma and having massive pulmonary tumor embolus is presented. Attention was called to the occult tumor by the identification of clear cell carcinoma in the pulmonary embolic material. Pulmonary embolectomy and surgical extirpation of the primary tumor resulted in long-term survival.