ArticleJournal of the peripheral nervous system : JPNS2026
Nonsystemic Vasculitic Neuropathy Presenting as Inflammatory Demyelinating Polyradiculoneuropathy.
Article in Journal of the peripheral nervous system : JPNS, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
BACKGROUND AND
aimsNonsystemic vasculitic neuropathy classically presents as a painful asymmetric axonal neuropathy, multiple mononeuropathies or radiculoplexus neuropathy. Demyelinating electrophysiologic features are rare and may lead to misdiagnosis. We describe a patient with biopsy-proven vasculitic neuropathy presenting as a severe symmetric demyelinating polyradiculoneuropathy.
methodsClinical, electrophysiologic, imaging, laboratory, and histopathologic findings are presented.
resultsA 57-year-old man developed acute ascending weakness, sensory loss, facial weakness, and areflexia following a febrile illness, with initial improvement before developing recurrent neurological decline 6 weeks after initial symptom onset despite treatment with intravenous immunoglobulin and plasma exchange. Cerebrospinal fluid protein was elevated. Nerve conduction studies demonstrated prolonged distal motor latencies, slowed conduction velocities, conduction block, and prolonged blink reflex latencies, fulfilling 2021 European Academy of Neurology/Peripheral Nerve Society electrodiagnostic criteria for chronic inflammatory demyelinating polyradiculoneuropathy (CIDP). MRI demonstrated mild but diffuse lumbosacral plexus enlargement and T2 hyperintensity. Sural nerve biopsy ultimately demonstrated evidence of epineurial inflammation and microvasculitis with ischemic nerve injury, accompanied by both increased rates of axonal degeneration (12%) and segmental demyelination (9%) on teased fiber analysis. Treatment with corticosteroids and rituximab resulted in complete neurological recovery.
interpretationVasculitic neuropathy may closely mimic CIDP clinically, radiologically, and electrophysiologically. Clues to the vasculitis diagnosis were prominent neuropathic pain, dense denervation on electrophysiology, and poor response to typical CIDP treatment. Peripheral nerve biopsy remains a critical tool in the evaluation of atypical or treatment-refractory inflammatory neuropathies.
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