Fig. 4.

Treatment of a right renal tumour with image guided thermal ablation with the assistance of CO2 injection. a contrast enhanced CT demonstrating an anterior right renal tumour close to the colon (arrow). b patient was positioned in lateral decubitus and a small needle was inserted in between the tumour and the colon (arrow). c CO2 was injected through the small needle (arrow) in order to achieve colon displacement. d an umbrella-shaped radiofrequency electrode (arrow) was inserted into the tumour from the opposite site of the colon, and slight traction made in order to displace the organ. e a contrast enhanced CT performed 24 h after the ablation demonstrated good ablation of the tumour (arrow) without complications