title: Bilateral infraorbital nerve involvement in idiopathic orbital myositis.
abstract: We describe a case of bilateral infraorbital nerve involvement in idiopathic orbital myositis. Computed tomographic scanning of the orbits showed enlargement of extraocular muscles consistent with orbital myositis and enlargement of the ipsilateral infraorbital nerve. With disease progression, infiltration of the contralateral infraorbital nerve also developed. Biopsies of the inferior oblique muscle and infraorbital nerve showed the same inflammatory infiltrate: a mixed population of lymphocytes (B and T) with B cells expressing kappa and lambda light chains. Although orbital myositis may be associated with several conditions, to the best of our knowledge, this is the first time a case of idiopathic orbital myositis with bilateral infraorbital nerve involvement has been described.
authors.affiliation: Department of Ophthalmology, Otorhinolaryngology, and Head and Neck Surgery, School of Medicine of Ribeirão Preto, University of São Paulo, Brazil, USA.
authors.forename: Gustavo B
authors.initials: GB
authors.lastname: Siqueira
authors.forename: Arun
authors.initials: A
authors.lastname: Jain
authors.forename: Fernando
authors.initials: F
authors.lastname: Chahud
authors.forename: Antonio A V
authors.initials: AA
authors.lastname: Cruz
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D009220:Myositis / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000473:pathology; D009420:Nervous System / Q000000981:diagnostic imaging / Q000473:pathology; D009915:Orbit / Q000294:innervation*; D009916:Orbital Diseases / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000473:pathology; D014057:Tomography, X-Ray Computed