Pelvic Pain Treated With MR-guided Cryoanalgesia

Inclusion Criteria: * 18 to 100 years * Chronic pelvic pain for at least 3 months and no adequate pain relief defined as persistent worst pain 4 or above on an 11-point visual analogue scale of 0 (no pain) to 10 (pain as bad as subject can imagine) despite conservative treatments, including but not limited to oral pain medication including NSAIDs and narcotics, physical therapy, and nerve block. * The 'worst pain' must be reported to be 4 or above on an 11-point visual analogue scale of 0 (no pain) to 10 (pain as bad as subject can imagine) * Pain must be from a single lumbosacral nerves confirmed with selective nerve blocks providing adequate temporary pain. The selectivity of the nerve block will be confirmed on MR images documenting that the injected local anesthetic immerses the targeted nerve and that there is absence of spread of local anesthetic to adjacent nerves to exclude confounding anesthesia. Adequate pain relief will be defined by pain relief of greater 50% after the nerve block and rest and with aggravating exercise. * The target nerve is amenable to cryoablation with MRI guidance * Cryoablation should be performed within 3 months of the nerve block * No debilitating medical or psychiatric illness that would preclude giving informed consent or receiving optimal treatment and follow-up * Known coagulopathy or bleeding disorders are controlled Exclusion Criteria: * Confounding pain syndromes or conditions. * Previous nerve surgery * Currently pregnant, nursing…