Kidney tumour metabolism may have chemical signatures that distinguish indolent from aggressive small renal masses (SRM). Indolent or benign SRM could be managed conservatively. Here we have used two dimensional (2D) COrrelation SpectroscopY (COSY) on nephrectomy samples to assign and measure metabolite and lipid resonances. High level bioinformatics analysis was then applied. We report metabolic chemical signatures that can be used to distinguish histologically-diagnosed kidney tumour subtypes.