Magnetic Resonance Imaging of Idiopathic Orbital Myositis.
Journal
Ophthalmic plastic and reconstructive surgery
ISSN: 1537-2677
Titre abrégé: Ophthalmic Plast Reconstr Surg
Pays: United States
ID NLM: 8508431
Informations de publication
Date de publication:
27 Feb 2024
27 Feb 2024
Historique:
medline:
1
3
2024
pubmed:
1
3
2024
entrez:
1
3
2024
Statut:
aheadofprint
Résumé
To characterize the qualitative and quantitative features of idiopathic orbital myositis (IOM) on MRI. This was a multicenter retrospective study of patients with active IOM with MRI. Patients with incomplete clinical records, poor-quality or interval scans without active myositis, and specific orbital myositis (i.e., orbital myositis secondary to an identified condition) were excluded. An enlargement ratio was calculated by dividing the diameters of the affected extraocular muscle (EOM) by the contralateral unaffected EOM. Twenty-four patients (mean age: 44.4 ± 17.8 years-old, male: 11) between 2011 and 2022 were included. One case (4.2%) was pediatric (17 years old), and 6 cases presented with recurrence. Active IOM was characterized by fusiform EOM enlargement, high T2 signal, and contrast enhancement. Average maximal EOM diameters ranged from 4.6 to 7.7 mm (enlargement ratio: 1.4-2.2). Eighteen (75%) patients had single EOM involvement, most commonly the medial rectus. Other ipsilateral structures affected included focal orbital fat (16/24, 66.7%) and lacrimal gland (8/24, 33.3%). Contralateral changes in the EOM and/or lacrimal gland were observed in 7 patients (29.2%). Patients presenting with recurrence were likely to develop ongoing recurrent episodes (p = 0.003). Various radiological patterns of involvement described including EOM enlargement, contrast enhancement, abnormal signal, and involvement of other orbital structures are indicative of active IOM. IOM remains a heterogeneous spectrum of acute and chronic clinico-radiological presentations. Inflammation may involve other ipsilateral or contralateral orbital structures or may be bilateral despite presenting clinically as unilateral disease. Quantitative measurements may have utility in differentiating IOM from other causes of orbital myositis.
Identifiants
pubmed: 38427822
doi: 10.1097/IOP.0000000000002640
pii: 00002341-990000000-00358
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Informations de copyright
Copyright © 2024 The American Society of Ophthalmic Plastic and Reconstructive Surgery, Inc.
Déclaration de conflit d'intérêts
The authors have no financial or conflicts of interest to disclose.
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