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- W2369806940 abstract "Objective To explore oculomotor nerve and extraocular muscle(EOM) abnormalities in Duane retraction syndrome(DRS).Design Prospective case series.Participants Thirty one patients with DRS.Methods Magnetic resonance imaging(MRI) examinations were performed on thirty-one DRS patients on 1.5T magnetic resonance(MR) unit(Twin Speed,GE).Nerves to EOMs were im-aged with T1 weighted in all patients in quasi-coronal planes using dual-phased surface coils.A head coil was used.0.6 mm thick slices without interval space were obtained in axial plane using three dimensional fast imaging,employing steady state acquisition(FIESTA) sequence without enhancement.Oculomotor nerves,acquired with multi-planar reconstruction(MPR),were observed in oblique-axial and oblique-sagittal planes.Main Outcome Measures The developmental condition of the oculomotor nerves and EOMs.Results Forty eyes of 31 patients were involved.DRSⅠ: Thirty two eyes were involved.Twenty-nine abducens nerve(CN6) in the cis-tern and cavernous sinus were absence and 3 were hypoplasia.Eighty-four percent of oculomotor nerve(CN3) to the lateral rectus mus-cle in the orbit was apparently misdirected.There were no abnormalities of EOMs.Four cases demonstrated thinner CN6 in the cistern but normal trace in the cavernous sinus and the orbit.These four patients had no clinical signs of DRS.Additionally there were 4 pa-tients with hypoplasia of inner ear.DRSⅡ: One eye was involved.The CN6 in the cistern was substituted by irregular chords and in the cavernous sinus it was absent.In the orbit a nervous ramification entered the lateral rectus.DRSⅢ: Three CN6 were absent in the cis-tern and cavernous sinus.Apparent branches to the lateral rectus muscles were shown in the orbits and the muscles were normal.Hy-poplasia of the superior rectus and levator palpebrae superioris muscle and abnormality of the gray matter beside the lateral cerebral ventricle was found in one patient.Inverse DRS: Two patients were involved bilaterally.Hypoplasia of superior oblique muscles on both sides was found in these patients.Apparent misdirection of CN3 to the lateral rectus muscle was shown only in one orbit.Conclusion MRI can directly demonstrate absence or hypoplasia of CN6 in DRS,which is helpful to the diagnosis and differential diagnosis.This may also suggest that the disinnervation or displasia of the ocular motor nerves is one of the possible mechanism of strabismus." @default.
- W2369806940 created "2016-06-24" @default.
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- W2369806940 date "2010-01-01" @default.
- W2369806940 modified "2023-09-24" @default.
- W2369806940 title "MRI study of the Duane retraction syndrome" @default.
- W2369806940 hasPublicationYear "2010" @default.
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