This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
All of the following modalities can be used for in-situ ablation of liver secondaries, except 
Select and explain. 
A. Ultrasonic waves, B. Cryotherapy, C. Alcohol, D. Radio frequency
A: Ultrasonic waves
Answer: A: Ultrasonic waves 
Explanation: A i.e. Ultrasonic waves Ultrasonic waves (i.e. USG) have been used to improve placement of probe delivering intralesional ethanol injection, radiofrequency ablation and cryotherapyQ. It is not used for insitu abalation of liver tumor (primary & secoandary). Treatment modalities for liver secondaries Liver transplant (in patients with single lesion < 5 cm or three or fewer, lesions < 3 cm) but usually not recommended Hepatic aery embolization & chemotherapy (chemoemb olizati on)Q Intralesional insitu abalation ultrasound guided -Percutaneous ethanaol (alcohol) injection -Cryo ther apy Q -Radiofrequency ablationQ -Microwave coagulation therapy.