 After their biopsies, patients will be scheduled to come for a renal ultrasound and SWE. SWE examination will be conducted using an ultrasound machine equipped with a Philips Epiq ARFI Shear wave ElastPQ C1-5 mHz transducer. Shear wave velocity will be obtained and an estimate of tissue elasticity Youngs modulus will be calculated. All measurements will be performed by one of two qualified radiology physicians who will be blinded to the clinical and pathological data. We will allow a period of 90 days to obtain the images after the biopsy; otherwise the patient is no longer eligible to participate. 