[Magnetic resonance imaging in horizontal oculomotor paralysis caused by infarction].
Four patients with focal brainstem ischemic strokes and various types of horizontal oculomotor disturbances have been studied clinically and radiologically. One had a six nerve palsy, one a unilateral internuclear ophthalmoplegia, one a Fisher's one-and-a-half syndrome, and one a paramedian pontine reticular formation syndrome with a sixth nerve palsy. In all patients a C.T. Scan and a Magnetic Resonance Imaging (MRI) were obtained. The MRI study was performed on a CGR Magniscan 5000 with a superconducting magnet of 0.5 Tesla. In all patients a hypersignal in T2 weighted images was shown and corresponded to the brainstem infarct. MRI allowed accurate delineation of the lesion and clinico-radiologic correlations in three patients. But the low specificity of MRI does not permit to distinguish edema from necrosis, gliosis or demyelination in a region with a pathological MRI signal. In one patient this low specificity and perhaps partial volume effects decreased the accuracy of the clinico-topographic correlation.
Hommel
M
M
Clinique Neurologique, C.H.U. Grenoble.
Besson
G
G
Tarel
V
V
Gaio
J M
JM
Pollak
P
P
Borgel
F
F
Le Bas
J F
JF
Perret
J
J
D000010:Abducens Nerve / Q000473:pathology; D001933:Brain Stem / Q000098:blood supply*; D002544:Cerebral Infarction / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009886:Ophthalmoplegia / Q000209:etiology*; D011446:Prospective Studies; D012154:Reticular Formation / Q000473:pathology; D014057:Tomography, X-Ray Computed
L'imagerie par résonance magnétique dans les paralysies de l'oculomotricité horizontale par infarctus.