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Pseudo-tumours, a clinical concept.

H J Peeters, P van Heerde, T M Feltkamp-Vroom

    Documenta Ophthalmologica. Advances in Ophthalmology
    |January 29, 1982
    PubMed
    Summary
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    Orbital space-filling lesions include inflammatory processes, tumors, and pseudotumors. Pseudotumors, characterized by chronic inflammation, comprise 11% of orbital lesions and can mimic lymphomas.

    Area of Science:

    • Ophthalmology
    • Pathology

    Background:

    • Space-filling lesions in the orbit are categorized into inflammatory processes, tumors, and pseudotumors.
    • Pseudotumors represent chronic, infiltrating inflammatory conditions, diagnosed in 11% of patients at the Orbital Centre in Amsterdam.
    • The heterogeneity of pseudotumors is notable, with varying dominant cell types, often lymphocytic, potentially progressing to lymphoma.

    Purpose of the Study:

    • To review the classification and characteristics of orbital space-filling lesions, with a focus on pseudotumors.
    • To highlight the diagnostic challenges and potential malignant transformation of orbital pseudotumors.

    Main Methods:

    • Review of 340 consecutive patients diagnosed with orbital space-filling lesions.
    • Analysis of pathological characteristics, including dominant cell types and inflammatory patterns.

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  • Clinical correlation of symptoms such as rapid development, pain, edema, motility disorders, and visual loss.

    • Main Results:

    • Pseudotumors constitute a significant category of orbital space-filling lesions (11% of cases).
    • Lymphocytic infiltration is common in pseudotumors, with follicular arrangements termed pseudolymphoma, which may evolve into non-Hodgkin lymphoma.
    • Other pseudotumors exhibit dominant inflammatory lymphoid infiltration, linked to immunological processes like myositis, sclerotenonitis, and Graves' ophthalmopathy.

    Conclusions:

    • Orbital pseudotumors are a diverse group of lesions requiring careful pathological classification.
    • The potential for pseudotumors to mimic or transform into malignant lymphomas necessitates vigilant monitoring.
    • Understanding the immunological basis of some pseudotumors is crucial for accurate diagnosis and management.