Abstract
Involvement of the pontine horizontal conjugate gaze center and the ipsilateral medial longitudinal fasciculus produces a distinctive constellation of eye movements in which vertical gaze is unimpaired, the ipsilateral eye is fixed in horizontal gaze, and the contralateral eye is able to abduct only in the horizontal plane. This syndrome has been the subject of several case reports,<sup>1-4</sup>having been called the "one and a half syndrome" by Fisher<sup>2</sup>and "paralytic pontine exotropia" by Sharpe et al.<sup>4</sup> Causes of internuclear ophthalmoplegia with a conjugate gaze paralysis have included infarcts,<sup>1-4</sup>gliomas of the brainstem,<sup>3,4</sup>vascular malformations,<sup>4</sup>and demyelinating disease.<sup>3</sup>We report a case of the one and a half syndrome caused by trauma, with computerized tomographic (CT) correlation. <h3>REPORT OF A CASE</h3> An 11-year-old girl was in good health until ten days before admission to the Tucson (Ariz) Medical Center, when she was injured
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