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Extraocular Muscle Palsy in Patients with Chronic Orbital Myositis
Mohammad Reza Akbari1, Arash Mirmohammadsadeghi1, Bahram Eshraghi2
1Eye Research Center, Strabismus Department, Farabi Eye Hospital, Tehran University of Medical Sciences , Tehran, Iran.
Background:
Orbital myositis (OM) is a subgroup of idiopathic orbital inflammation. It can involve single or multiple extraocular muscles and result in restriction or paresis of extraocular muscles.
Method:
We reported two unusual cases of extraocular muscle paresis in the fibrotic stage of chronic OM and reviewed the literature related to this finding.
Results:
The first case was of a 38-year-old woman with chronic OM with large-angle right eye exotropia and right medial rectus paresis. She received a botulinum A toxin injection into the right lateral rectus muscle as a first treatment, but it was unsuccessful in correcting her deviation. Subsequently, she underwent two strabismus surgeries, which successfully resolved her diplopia in primary gaze. The second case was of a 35-year-old woman with chronic OM and left lateral rectus palsy, which was managed with a botulinum A toxin injection.
Conclusion:
OM can cause extraocular muscle palsy in the chronic fibrotic stage of the disease.
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