Recurrent orbital myositis mimicking sixth nerve palsy

Introduction: Diplopia with uncrossed double vision upon lateral gaze is typically attributed to ipsilateral sixth nerve palsy. Orbital myositis implies orbital inflammation confined to one or more extraocular muscles and usually begins acutely with unilateral (peri)orbital pain, particularly on eye movement, and diplopia due to restriction of extraocular muscle movement. In addition, eyelid swelling and conjunctival injection may be present1. Due to these additional symptoms and due to the occurrence of pain, orbital myositis usually can be easily differentiated from nerve lesions as causes of diplopia. Here, w…