A Rare Cause of Diplopia: Idiopathic Orbital Myositis

Orbital myositis is an entity affecting the ocular muscles, especially the medial rectus. These cases are usually referred to clinics with complaints such as diplopia, orbital/periorbital pain, limitation in ocular movements, increased pain with eye movements, proptosis, swelling of the eyelid and/or hyperemia in the conjunctiva. Orbital myositis is usually idiopathic and autoimmunity is often suspected in etiology. In this article, we present a 15-year-old girl who presented with diplopia, pain in both eyes, anomalous head posture, periorbital edema and was diagnosed with idiopathic orbital myositis through history, clinical findings and imaging methods.