ArticleClinical case reports2026
Dermatome-Specific Herpes Zoster Following Corticosteroid Therapy for Lumbar Disc Herniation: A Case Report Illustrating the Immunocompromised District Theory.
Article in Clinical case reports, 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
Systemic corticosteroids frequently utilized to manage lumbosacral radiculopathy introduce an immunological paradox by potentially triggering varicella-zoster virus reactivation. While well-documented in severely immunocompromised populations, the specific neuro-immunological mechanisms in otherwise immunocompetent patients with lumbar disc herniation remain underappreciated. This case presents an observation conceptually relevant to the "Immunocompromised District" theory, proposing a theoretical link between acute radicular compression and a localized vulnerability that may correlate with the precise anatomical distribution of a viral outbreak. A 52-year-old male presented with acute mechanical right-sided lumbar and anterior thigh pain. Magnetic resonance imaging revealed an acute L3-L4 disc herniation compressing the L4 nerve root, coexisting with an asymptomatic chronic L4-L5 herniation. Four days after initiating intravenous dexamethasone, the patient experienced a sudden phenotypic shift in symptoms: the mechanical dullness transformed into severe, electric-shock-like neuropathic pain. This heralded a herpes zoster eruption remarkably confined to the acutely symptomatic L4 dermatome, completely sparing the chronically compressed L5 region. Following corticosteroid discontinuation and initiation of antiviral therapy, the lesions resolved within 1 week, leaving mild post-herpetic neuralgia at the one-month follow-up. Given the lack of objective molecular data, we hypothesize a multifactorial pathogenesis for this phenomenon. A theoretical "double hit" mechanism-comprising corticosteroid-induced systemic immunosuppression and localized vulnerability from acute radiculopathy-may potentially facilitate viral reactivation in a susceptible host (e.g., possessing age-related and metabolic risk factors). Clinically, a sudden qualitative shift in pain phenotype from mechanical to neuropathic during steroid therapy for lumbar degeneration may serve as an early clinical clue of impending herpes zoster. Recognizing this dynamic prevents misinterpreting viral prodromes as mechanical exacerbations, thereby avoiding the detrimental escalation of immunosuppressive therapy.
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