[Unilateral paresis of the fourth cranial nerve as the only symptom of mesencephalic ischemia].
BACKGROUND
Lesions of the fourth cranial nerves are infrequently diagnosed in cases of disorder of the oculomotor nerves. Most authors consider head injury to be the usual cause of this lesion, which is also frequently seen in association with a microvascular lesion in persons with blood flow problems.


METHODS
We present the case of an isolated lesion of the trochlear nerve as a consequence of midbrain ischaemia.


CONCLUSIONS
Vascular disorders of the brain stem are an uncommon cause of paresis of the superior oblique muscle of the eye and exceptional as the only symptom.
Servicio de Neurología, Hospital Universitario, Salamanca, España. aguerrerop@medynet.com
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AL
Guerrero
J
J
Cacho
D000368:Aged; D002545:Brain Ischemia / Q000473:pathology*; D004172:Diplopia / Q000209:etiology / Q000503:physiopathology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008636:Mesencephalon / Q000473:pathology*; D010291:Paresis / Q000209:etiology* / Q000503:physiopathology*; D014321:Trochlear Nerve / Q000503:physiopathology*