In this study information from 432 people with small renal masses was assessed. These people had been treated with thermal ablation (radio-frequency or microwave ablation) and were assessed for complications, complete ablation of the tumour, kidney function, and return of the tumour. These were assessed according to tumour size.
The cut-off size for treatment of the tumour with thermal ablation was selected as the best tumour size for predicting outcomes in patients with small renal masses. The best tumour size was 3.2 cm. Tumours with diameters bigger than 3 cm had more complications, were less likely to be completely ablated, reduced kidney function, and were more likely to come back after treatment.