Assessing the Utility of Ultrasound Compared to Cross-Sectional Imaging in the Follow-up of Patients With Renal Cell Carcinoma

Inclusion Criteria: * Patients must be 18 year of age or older. * Patients having undergone radical or partial nephrectomy for the indication of renal cell carcinoma. * Most recent imaging study must have been either computed tomography (CT) or magnetic resonance imaging (MRI). Exclusion Criteria: * Patients with pT4 disease (tumor invades beyond the Gerota fascia: including contiguous extension into the ipsilateral adrenal gland). * Patients with metastatic disease prior to time of surgery requiring systemic treatment. * Patients with another active cancer diagnosis requiring systemic treatment. * Patients with contrast allergies. * Patients with baseline chronic kidney disease (GFR \< 45 ml/min/1.73 m2).