Ultrasound was performed to see if it is a solid neoplasm or complex cyst. First image shows no doppler flow. Upon review of this image, the tech was instructed to perform careful doppler and spectral interrogation of the mass, and turn down the color velocity scale (hard to see, but it is set at 27 cm/s in first image, and 18 cm/s after). As a result, both color doppler and arterial flow was identified in the mass, indicating a solid renal neoplasm.