Persistent hematuria caused by renal cell carcinoma after aortic valve replacement and warfarin therapy.

Hematuria is a common finding in renal cell carcinoma, and persistent hematuria, even in those receiving anticoagulation, warrants workup. We present a case of a patient with persistent hematuria who was found to have a renal mass that was not evident on renal ultrasound and computed tomography of the abdomen and pelvis but was seen on magnetic resonance imaging.