Idiopathic Orbital Inflammation and Associated Conditions
Summary
Idiopathic orbital inflammation encompasses a heterogeneous group of non-infectious, non-neoplastic inflammatory processes of the orbit for which no definitive systemic or local cause can be identified. Clinically, it may present as orbital pseudotumour, myositis, dacryoadenitis or diffuse and sclerosing variants, each characterised by varying degrees of pain, proptosis, restricted ocular motility and visual impairment. Histopathology typically reveals polymorphic inflammatory cell infiltrates, often with lymphocytes, plasma cells and occasional fibrosis. Although the precise aetiology remains elusive, prevailing evidence implicates immune-mediated mechanisms involving both B-cell and T-cell responses, cytokine release and, in certain subtypes, a fibrosing cascade. Imaging with magnetic resonance and computed tomography plays a central role in differentiating idiopathic orbital inflammation from infectious or neoplastic mimics, guiding biopsy decisions and monitoring treatment response. First-line therapy remains systemic corticosteroids, with steroid-sparing immunosuppressants or biologics such as B-cell depletion reserved for refractory or relapsing cases. Associated systemic disorders include antineutrophil cytoplasmic antibody vasculitis, IgG4-related disease and sarcoidosis, underscoring the need for a thorough multidisciplinary assessment. Advances in molecular diagnostics, targeted imaging and novel immunotherapies hold promise for more precise stratification and management of this vision-threatening condition.
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Idiopathic Orbital Inflammation and Associated Conditions publication trend
The graph below shows the total number of articles in idiopathic orbital inflammation and associated conditions across all publications each year (not limited to Nature Index journals).
Technical terms
Idiopathic orbital inflammation: A non-infectious inflammatory disorder of the orbit with no identifiable systemic or local cause.
Orbital pseudotumour: A benign mass-like inflammatory lesion in the orbit characterised by polymorphic inflammatory cell infiltrates.
Orbital myositis: Inflammation predominantly affecting extraocular muscles, leading to pain and motility restriction.
Nonspecific orbital inflammation (NSOI): A subtype of idiopathic orbital inflammation defined by absence of granulomatous or sclerosing histopathological features.
Rituximab: A monoclonal antibody targeting CD20-positive B cells, used to deplete B-cell populations in inflammatory disease.
Positron emission tomography (PET): A functional imaging modality detecting radiolabelled tracers to identify active inflammatory or neoplastic processes.
References
- Nonspecific Orbital Inflammation (NSOI): Unraveling the Molecular Pathogenesis, Diagnostic Modalities, and Therapeutic Interventions. International Journal of Molecular Sciences (2024).
- CT and MR imaging of orbital inflammation. Neuroradiology (2018).
- Zirconium-89-labelled rituximab PET-CT in orbital inflammatory disease. EJNMMI Research (2019).
- Orbital inflammatory pseudotumor: new advances in diagnosis, pathogenesis, and treatment. European Journal of Medical Research (2023).
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