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Polyarteritis confined to lower extremities.

O Laitinen, M Haltia, J Lähdevirta

    Scandinavian Journal of Rheumatology
    |January 1, 1982
    PubMed
    Summary
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    This study describes a rare case of polyarteritis affecting calf muscles, presenting with recurrent swelling and pain. Muscle biopsy revealed unique NADH-tetrazolium reductase activity, responding well to corticosteroid treatment.

    Area of Science:

    • Vascular Medicine
    • Muscle Pathology

    Background:

    • Polyarteritis nodosa is a systemic vasculitis.
    • Calf muscle involvement in polyarteritis is uncommon.

    Observation:

    • A 32-year-old woman presented with recurrent calf swelling and pain.
    • Episodes were characterized by acute inflammation followed by symptomless intervals.
    • Good response to corticosteroid therapy was noted.

    Findings:

    • Gastrocnemius muscle biopsy showed unusual layered NADH-tetrazolium reductase activity.
    • This activity pattern resembled annual rings within muscle fibers.
    • This specific histopathological finding is novel.

    Implications:

    • Highlights a unique presentation of polyarteritis in the calves.

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  • Suggests specific histopathological markers for diagnosis.
  • Informs potential therapeutic strategies for similar cases.