Fig. 1: Renal cell carcinoma: US features a. Longitudinal sonogram of right kidney showing a well defined isoechoic mass arising from the upper pole. b. Longitudinal sonogram of right kidney showing a predominantly hypoechoic mass arising from the lower pole. c. Longitudinal sonogram of right kidney showing a large predominantly hyperechoic mass sparing the upper pole. Perilesional hypoechoic halo (arrowhead) and intralesional cystic areas (arrow) seen here are characteristic of RCC, differentiating them from angiomyolipoma. d. US picture of cystic RCC showing a well defined lower polar cystic mass with thick irregular walls septations and solid components(arrows) e. Colour Doppler image of RCC. Spectral analysis shows peak systolic Doppler frequency shift of more than 2.5 KHz in one of the tumour vessel suggesting malignancy.