Paresis of Superior Rectus Muscle

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Abstract
The eye signs of dysthyroid disease may conveniently be divided into two varieties—congestive and noncongestive.1The congestive type of dysthyroid orbitopathy is characterized by decreased orbital resiliency, lid edema, chemosis, proptosis, visual impairment, and limitation of ocular motility. Although one or both eyes may be affected, in many instances the ocular signs may be minimal. The accompanying myopathy most commonly causes limitation of elevation or abduction. The weakness of upward gaze usually involves both elevators of the involved eye but there are patients who exhibit an isolated paresis of the superior rectus muscle.2,3These individuals may have a paucity of other ocular and systemic signs of thyroid dysfunction so that the underlying cause of the ophthalmoplegia may be overlooked. It is the purpose of this paper to report four cases of paresis of the superior rectus muscle associated with thyroid dysfunction. Report of Cases Case 1. —A

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