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Aseptic Arachnoiditis in a Patient Treated With Intrathecal Morphine Infusion: Symptom Resolution on Switch to Ziconotide

Since 1980, about 95,000 intrathecal (IT) drug delivery pumps have been implanted for the administration of a variety of opioid and non‐opioid agents for neuropathic and nociceptive pain patients. IT granuloma in chronic opioid infusion is becoming less rare as an adverse effect of IT therapy and has been associated with many analgesic infusion agents.