title: Focal orbital amyloidosis presenting as rectus muscle enlargement: CT and MR findings.
abstract: We report a case of focal orbital amyloidosis involving rectus muscles, which is an extremely rare clinical condition. CT scans showed rectus muscle enlargement with punctate calcifications. Heterogeneous hypointensity was present on T2-weighted MR images, and homogeneous enhancement was seen on fat-saturated contrast-enhanced images of the muscles. These imaging findings seem to be suggestive of amyloidosis. Focal amyloidosis should be included in the differential diagnosis of extraocular muscle enlargement.
authors.affiliation: Department of Radiology, Niigata University School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Okamoto
authors.forename: J
authors.initials: J
authors.lastname: Ito
authors.forename: I
authors.initials: I
authors.lastname: Emura
authors.forename: T
authors.initials: T
authors.lastname: Kawasaki
authors.forename: T
authors.initials: T
authors.lastname: Furusawa
authors.forename: K
authors.initials: K
authors.lastname: Sakai
authors.forename: S
authors.initials: S
authors.lastname: Tokiguchi
mesh_terms: D000686:Amyloidosis / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009135:Muscular Diseases / Q000175:diagnosis*; D009801:Oculomotor Muscles / Q000000981:diagnostic imaging / Q000473:pathology; D009916:Orbital Diseases / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed