If you are undergoing neurolysis, there are a number of techniques that the interventional radiologist may use. The most common method of causing permanent nerve destruction is the injection of a chemical such as alcohol. Alternately, the interventional radiologist may choose to use ablation techniques to destroy the nerves. In these cases, the interventional radiologist will insert a needle or a thermal probe into the area so it is in contact with the nerve or the plexus.
If you are having a nerve block, the interventional radiologist will use a single thin needle to inject anaesthetics (sometimes mixed with anti-inflammatory drugs) into the area around the nerves responsible for pain.
Because these procedures are carried out under image guidance, the interventional radiologist can target the precise area, which reduces the risk of complications when targeting deeply situated nerves.