American Orthoptic Journal Abstract
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Volume 46, 1996, p. 167–170
Isolated Inferior Rectus Paresis as the Presenting Manifestation of Myasthenia Gravis (Abstract)
Andrew G. Lee, M.D., and Cynthia W. Avilla, C. O.
Isolated inferior rectus paresis is an uncommon clinical finding, but may be the presenting manifestation of myasthenia gravis. We report a patient with an isolated inferior rectus paresis in the right eye. Initial Tensilon7 testing, Prostigmin7 testing, antiacetylcholine receptor antibody testing, and single fiber EMG were negative. A second Tensilon7 test was positive after the patient developed ptosis and weakness of the left medial rectus muscle. Myasthenia gravis should be considered in any patient with an isolated, non-traumatic inferior rectus muscle palsy.
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