Renal cell carcinoma is seen most frequently after childbearing years, but occasionally is diagnosed in pregnancy. The pregnancy demands special considerations in terms of the diagnostic evaluation and management. A case of a patient with renal cell carcinoma diagnosed in the first trimester of pregnancy, which suddenly enlarged at the end of the second trimester, is presented. She underwent radical nephrectomy after delivery. Since the mother's welfare is the primary concern, surgical management should not be delayed.