Orbital intramuscular schwannoma.
In an 8-year-old girl with asymptomatic proptosis, computed tomographic scans showed a large medial orbital mass that contoured the globe anteriorly, bowed the optic nerve laterally, and extended posteriorly to the orbital apex. T1-weighted coronal magnetic resonance images showed the mass to be a diffusely enlarged medial rectus muscle. Histopathologic examination of a medial rectus muscle biopsy specimen disclosed a multinodular, intramuscular schwannoma, separating and infiltrating normal skeletal muscle fibers. The intramuscular location and multinodular configuration of this tumor, together with its occurrence in a child, distinguish it from previous orbital schwannomas.
Capps
D H
DH
Department of Ophthalmology, University of Arkansas for Medical Sciences, Little Rock.
Brodsky
M C
MC
Rice
C D
CD
Mrak
R E
RE
Glasier
C M
CM
Brown
H H
HH
D001706:Biopsy; D002648:Child; D005094:Exophthalmos / Q000209:etiology; D005133:Eye Movements; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D009442:Neurilemmoma / Q000175:diagnosis* / Q000601:surgery / Q000648:ultrastructure; D009801:Oculomotor Muscles / Q000601:surgery / Q000648:ultrastructure; D009918:Orbital Neoplasms / Q000175:diagnosis* / Q000601:surgery / Q000648:ultrastructure; D014057:Tomography, X-Ray Computed