title: Magnetic susceptibility artifact in orbital magnetic resonance imaging.
abstract: Case report of a 16-year-old boy presenting with total hyphema due to blunt trauma to the left eye. During a subsequent cinematic MRI scan to identify salvageable lateral rectus muscle, the attachment of the left lateral rectus was obscured by a 20-mm diameter signal void. A subsequent CT scan for a suspected metallic foreign body revealed the muscle attachment after all. The theoretical explanations for this finding are discussed.
authors.forename: S I
authors.initials: SI
authors.lastname: Chen
authors.forename: A
authors.initials: A
authors.lastname: Chandna
authors.forename: L J
authors.initials: LJ
authors.lastname: Abernethy
authors.forename: L J
authors.initials: LJ
authors.lastname: Aberneythy
mesh_terms: D000293:Adolescent; D016477:Artifacts; D019274:Botulinum Toxins, Type A / Q000627:therapeutic use; D004948:Esotropia / Q000175:diagnosis / Q000188:drug therapy; D005129:Eye Foreign Bodies / Q000175:diagnosis* / Q000209:etiology; D005131:Eye Injuries / Q000150:complications; D006801:Humans; D006988:Hyphema / Q000209:etiology / Q000601:surgery; D007906:Lens Subluxation / Q000209:etiology / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D009801:Oculomotor Muscles / Q000000981:diagnostic imaging / Q000187:drug effects / Q000473:pathology*; D020221:Optic Nerve Injuries / Q000209:etiology / Q000601:surgery; D009915:Orbit / Q000473:pathology*; D014057:Tomography, X-Ray Computed; D014949:Wounds, Nonpenetrating / Q000150:complications
chemical_list: D019274:Botulinum Toxins, Type A