Inflammation of extraocular muscles can occur in a number of conditions.
Clinical presentation:
(1) painful diplopia
(2) ophthalmoplegia
(3) chemosis
CT or MRI may show enlargement of affected muscle.
Possible causes:
(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
(5) idiopathic
