Microvascular decompression A neurosurgical (microsurgical) procedure that involves accessing via the posterior fossa the trigeminal nerve just at its point of entry into the brain. Any vessels distorting or in close contact with the nerve are moved out of the way with the aim of avoiding nerve damage and hence preserving function. This procedure requires general anaesthetic. It is the only neurosurgical procedure designed to spare the trigeminal nerve from damage, and to directly address the cause of trigeminal neuralgia in most cases, rather than just relieve the symptom of pain. Results of this procedure vary the most from surgeon to surgeon.