Hyperechoic lesion in kidney. Advise!

Pls advise regarding the following USG report : Suspicious hyperechoic lesion along the medial margin of left kidney. Kidneys: Right kidney measures 96 X 38 mm. Left kidney measures 93.1 X 43.5 mm. Cortical echogenicity appears normal. Corticomedullary differentiation is maintained on both sides.An apparently hyperechoic fat containing suspicious lesion is noted adjacent to upper part of the medial cortex of left kidney, measuring approx. 3.1 x 3.1 cm. No obvious internal vascularity is seen. No focal lesion is seen in right side. Pelvicalyceal system is mildly split on right side in pre void stages. After voiding it becomes normal. Left pelvicalyceal system appears normal. No calculus seen on either side. Bilateral ureters are not dilated.