Bone lesion cryotherapy: pictorial review and review of current evidence.

Over the last two decades the development of small probes has enabled percutaneous use of cryotherapy. Cryotherapy, also known as cryoablation, enables the treatment of much larger lesions than other thermal ablation techniques, particularly when using multiple evenly spaced probes. Using rapid cooling to as low as -200 degrees Celsius (at the tip of the probe), reliable, and predictable necrosis can be induced. Probes are usually percutaneously inserted under computed tomography (CT) guidance under sedation or general anaesthesia, often as a day case. The procedure is safe with severe complications occurring rarely; the commonest complication is neural injury in lesions closely related to neurovascular bundles. Cryotherapy has been applied to the symptomatic and occasionally curative treatment of bone metastases and a range of primary bone lesions. This review summarises the published evidence base for the use of cryotherapy in metastatic and primary bone lesions and describes the experience with cryotherapy at the Royal Orthopaedic Hospital, Birmingham, a quaternary bone tumour referral hospital, where cryotherapy has been used for 3 years.