Percutaneous MR-guided cryoablation for malignancies, with a focus on renal cell carcinoma.

Cryosurgery is the oldest thermal ablation method, and was first performed in the mid-nineteenth century. Since the development of cryosurgical systems capable of delivering liquid nitrogen, organs in various regions have been treated with cryosurgery. However, the lack of an adequate monitoring modality during the freezing process did not allow the precise and complete destruction of lesions deep inside the parenchyma. This led to local recurrences caused by unsatisfactory results of treatment. Recently, a magnetic resonance (MR)-compatible argon-based cryoablation system has been developed, and a combination of this cryoablation system and MR imaging has been shown to be an effective method for treating malignant tumors. In this article, we describe our clinical experience of percutaneous MR-guided cryoablation for malignancies, focusing on renal cell carcinoma.