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Isolated subcutaneous nodules (pseudorheumatoid)

H J Williams, E C Biddulph, S S Coleman

    The Journal of Bone and Joint Surgery. American Volume
    |January 1, 1977
    PubMed
    Summary
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    This study examined ten patients with isolated subcutaneous nodules resembling rheumatoid nodules. These nodules were often multiple, recurrent, and self-resolving, without systemic illness, suggesting a distinct clinical entity.

    Area of Science:

    • Dermatology
    • Rheumatology
    • Pathology

    Background:

    • Rheumatoid nodules are typically associated with rheumatoid arthritis.
    • Isolated subcutaneous nodules can present diagnostic challenges.

    Purpose of the Study:

    • To characterize the clinical and histological features of isolated subcutaneous nodules.
    • To differentiate these nodules from other soft tissue tumors and rheumatoid nodules associated with systemic disease.

    Main Methods:

    • Histological examination of nodules from ten patients.
    • Clinical evaluation for systemic associations.

    Main Results:

    • Nodules were histologically similar to rheumatoid nodules but lacked systemic rheumatoid disease.

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  • One nodule was initially misdiagnosed as fibrosarcoma due to intense fibroblastic reaction.
  • Lesions were often multiple, recurrent, and showed spontaneous regression.

    • Conclusions:

    • Isolated subcutaneous nodules represent a distinct entity, potentially different from rheumatoid nodules linked to systemic disease.
    • The etiology remains unclear, but progression to systemic rheumatoid disease is unlikely.