Mixed Pain (Nociceptive and Neuropathic)

The goal of this clinical trial is to determine whether a sigma-1 receptor PET/MRI scan can help identify the specific nerves responsible for chronic pain. Researchers will use an investigational imaging agent called \[18F\]FTC-146 to look for signs of pain generating nerve irritation or injury that may not be visible on convention imaging tests. Participants whose pain-generating nerve can be identified may undergo a diagnostic nerve block and, if successful, a standard clinical procedure called cryoneurolysis will be used to temporarily interrupt pain signals.

The purpose of this study is to compare the uptake of \[18F\]FTC-146 in healthy volunteers to that of individuals suffering from chronic pain with Spinal or Peripheral Nerve Origin. Primary Objectives: A) To quantify the bio-distribution of \[18F\] FTC-146 uptake in subjects with Spinal or Peripheral Nerve Origin pain and compare it with healthy controls. B) To determine whether painful schwannomas can be differentiated from non-painful schwannomas based on imaging. Secondary Objectives: A) To assess the reproducibility of \[18F\]FTC-146 PET imaging within the same healthy volunteer subjects using Test-Retest analysis. B) To investigate whether post-treatment \[18F\]FTC-146 uptake differs from pre-treatment uptake and correlate the imaging with subject reported pain level after treatment