Inclusion Criteria:

- Patients 18 and older.

- Patients willing and able to sign consent.

- Patients with an organ confined renal mass planning to undergo a robotic assisted
partial nephrectomy (RAPN).

- Patient with Karnofsky Performance Status (KPS) equal to or greater than 40.

Exclusion Criteria:

- Patients under 18.

- Patients with Karnofsky Performance Status (KPS) less than 40.

- Patients with non-organ confined renal masses (invading renal vein, inferior vena
cava, peri-renal tissue, ipsilateral adrenal gland, or metastasis).

- Patients with bilateral synchronous renal masses.

- Patients who can not discontinue aspirin, Plavix, Coumadin or other anti-platelet or
anti-coagulant medications.

- Patients with renal lesions determined to be too complex to perform a RAPN without
clamp by the surgeon. (The renal mass may be deemed too difficult based on
pre-operatively radiological findings. The surgeon's decision to exclude a mass from
a robotic assisted partial nephrectomy would be based on a higher risk of positive
margin or complication if a RAPN was performed.)