Enlarged orbital rectus muscles

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