1, generally need to do head MRA before surgery to determine the relationship between the facial nerve and the surrounding blood vessels on the twitch side, and also need to do some common laboratory tests (including routine blood, biochemistry, hepatitis B five, three antibodies, coagulation 4), chest X-ray, electrocardiogram, cardiac ultrasound and other auxiliary tests before surgery. Before doing head MRA, you need to pay attention to whether there are metal implants in your body due to surgery or trauma, such as pacemakers, vascular stents, metal dental crowns, orthopedic internal fixation materials, etc. Some materials can’t be done by MRI, some can, and specific consultation is needed. 2, very few people can see no obvious vascular compression next to the facial nerve in the head MRI, you need to read the original MRI images carefully on the computer, if the MRA sequence and CISS sequence do not see the vascular image next to the facial nerve root, then it is not recommended to do microvascular decompression, you can consider local Botox injection or oral medication.