title: Orbital myositis following an upper respiratory tract infection: contribution of high resolution CT and MRI.
abstract: A case of isolated unilateral extraocular muscle myositis following an acute upper respiratory tract infection is reported. Painful eye movements, restricted eye motility and exophthalmus but a normal visual acuity are the most important clinical findings. High resolution contrast enhanced CT and MRI are the imaging modalities of choice to differentiate from other orbital pathologies. The solitary enlarged muscle was clearly seen on both the contrast enhanced CT and the MR examination. Preseptal cellulitis was better seen on MRI, whereas high resolution CT was superior in the demonstration of periscleritis. Graves' ophthalmopathy and orbital cellulitis first have to be excluded. Corticosteroids are the therapy of choice in orbital myositis. A control, contrast enhanced CT after 4 weeks showed an almost normal muscle.
authors.affiliation: Department of Ophthalmology, University Hospitals KU Leuven, Belgium.
authors.forename: I
authors.initials: I
authors.lastname: Casteels
authors.forename: C
authors.initials: C
authors.lastname: De Bleecker
authors.forename: P
authors.initials: P
authors.lastname: Demaerel
authors.forename: W
authors.initials: W
authors.lastname: Van Wilderode
authors.forename: L
authors.initials: L
authors.lastname: Missotten
authors.forename: G
authors.initials: G
authors.lastname: Wilms
authors.forename: A L
authors.initials: AL
authors.lastname: Baert
mesh_terms: D000305:Adrenal Cortex Hormones / Q000627:therapeutic use; D000328:Adult; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D009220:Myositis / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology*; D009916:Orbital Diseases / Q000209:etiology*; D012141:Respiratory Tract Infections / Q000150:complications*; D014057:Tomography, X-Ray Computed
chemical_list: D000305:Adrenal Cortex Hormones