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Two patients with findings ascribable to superior branch oculomotor nerve paresis and one patient with findings ascribable to an inferior branch paresis are described. In each patient the paresis was caused by an intra-axial midbrain lesion. These patients represent the first described cases of divisional oculomotor nerve paresis caused by intrinsic brainstem disease.
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Ksiazek et al. (1989) studied this question.
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