Focal orbital amyloidosis presenting as rectus muscle enlargement: CT and MR findings.
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.
Okamoto
K
K
Department of Radiology, Niigata University School of Medicine, Japan.
Ito
J
J
Emura
I
I
Kawasaki
T
T
Furusawa
T
T
Sakai
K
K
Tokiguchi
S
S
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