A Rare Cause of Diplopia: Idiopathic Orbital Myositis; A Case Report and Review of the Literature

Orbital myositis is an inflammatory disease affecting the extraocular muscles, especially the medial rectus. The 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, hyperemia in the conjunctiva. Orbital myositis is usually idiopathic and autoimmunity is often accused in etiology. It is reported that the disease is associated with polymyositis, thyroid diseases, juvenile rheumatoid arthritis, kawasaki disease, scleroderma, systemic lupus erythematosus, crohn's disease, ankylosing spondylitis. 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. In this article, it is aimed to draw attention to the diagnosis of idiopathic orbital myositis which is rare in childhood.