Inflammation of extraocular muscles can occur in a number of conditions.
(1) painful diplopia
CT or MRI may show enlargement of affected muscle.
(1) autoimmune disease (SLE, inflammatory bowel disease, IgG4-related, Grave's disease, etc)
(2) drug reaction
(3) infectious myositis (parasitic, COVID-19, etc)
(4) paraneoplastic reaction
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