Enlarged orbital rectus muscles

In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated. "Orbit" can refer to the bony socket, or it can also be used to imply the contents. [Source: Wikipedia ]

May Be Caused by

Common: Graves disease; Thyrotoxicosis
Uncommon: Acromegaly; Amyloidosis; Brown syndrome; Burkitt lymphoma; Carotid-cavernous fistula; Cavernous sinus thrombosis; Connective tissue disease; Cysticercosis; Extradural arteriovenous fistula; Foreign body reaction; Giant cell arteritis; Granulomatous disease; Hemangioma; Hemangiopericytoma; Increased venous pressure; Lethal midline granuloma; Leukemia; Lymphoma; Metastasis; Mikulicz syndrome; Neuroblastoma; Orbital cellulitis; Orbital infection; Orbital myositis; Orbital neoplasm; Orbital neurofibroma; Orbital pseudotumor; Orbital trauma; Paranasal sinusitis; Plasmacytoma; Polyarteritis nodosa; Rhabdomyoma; Rhabdomyosarcoma; Rheumatoid arthritis; Sarcoidosis; Scleroderma; Sjögren syndrome; Systemic lupus erythematosus; Tolosa-Hunt syndrome; Tuberculosis; Vasculitis; Wegener granulomatosis