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Anatomy
Neurologic examination reveals bilateral medial rectus paresis on attempted lateral gaze, monocular horizontal nystagmus in the abducting eye, and unimpaired convergence. The lesion is in the:
Caudal midbrain tectum.
Caudal pontine base.
Midpontine tegmentum, dorsomedial zones, bilateral.
Rostral midbrain, bases pedunculorum.
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