- Spinal stenosis
- Congenital
- Achondroplasia
- Hereditary (idiopathic)
- Acquired
- Ankylosing spondylitis
- Degenerative
- Iatrogenic
- Paget disease
- Post-traumatic
- Epidural lipomatosis
- Tethered cord syndrome
- Primary tumors
- Dermoid
- Ependymoma
- Epidermoid
- Ganglioneuroma
- Hemangioblastoma
- Lipoma
- Lymphoma
- Neurofibroma
- Osteoma
- Paraganglioma
- Plasmacytoma
- Schwannoma
- Leptomeningeal metastasis
- Leukemia
- Lymphoma
- Solid tumors
- Dural ectasia
- Lumbosacral spinal cysts
| - Diabetes
- Diabetic amyotrophy (diabetic lumbosacral radiculoplexus neuropathy)
- Thoracic radiculopathy
- Diabetic cervical radiculoplexus neuropathy
- Infectious non-HIV related
- Hepatitis C
- Human T-lymphotropic virus (HTLV-I)
- Lyme disease
- Mycobacteria
- Varicella-zoster virus
- Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
- HIV/AIDS-related
- Cryptococcal infection
- Cytomegalovirus infection
- Lymphomatous meningitis
- Mycobacterial infection
- Treponemal infection
- Arachnoiditis
- Idiopathic
- Intrathecal medications (eg, methotrexate)
- Neurocysticercosis
- Post-myelography
- Post-traumatic
- Subarachnoid hemorrhage
- Sarcoidosis
- Radiation-induced
- Checkpoint inhibitor immunotherapy (eg, ipilimumab, nivolumab, pembrolizumab)
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