ONLY A FEW cases (20) of ophthalmoplegia internuclearis anterior have been reported. In most of these cases lesions have been present in the brain stem. In only five cases could no pertinent lesions of the brain stem be demonstrated. Another such case should be of interest. Lhermitte1 introduced the term "internuclear ophthalmoplegia," and Lutz2 divided the internuclear ophthalmoplegias into two types, posterior and anterior. The former refers to inability of the eye to abduct on conjugate lateral gaze without the presence of diplopia; the latter, to inability of the eye to adduct on conjugate lateral gaze without the presence of diplopia and with retention of the function of the internal rectus muscle in convergence. The condition may be unilateral or bilateral.
Various investigators have noted paralysis of lateral conjugate gaze with the preservation of convergence. A tumor of the pons was found in Quioc's3 case of paralysis
MADONICK MJ. OPHTHALMOPLEGIA INTERNUCLEARIS ANTERIOR WITHOUT A LESION OF THE POSTERIOR LONGITUDINAL BUNDLE. AMA Arch NeurPsych. 1951;66(3):338–345. doi:10.1001/archneurpsyc.1951.02320090087007
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