An unusual case of Coats disease associated with Takayasu arteritis.

A 3-year-old Malay boy with strabismus in the left eye was found to have Coats disease in the same eye and underlying Takayasu arteritis. Coats disease is usually idiopathic but can be associated with systemic and ocular conditions. To our knowledge, this is the first reported case of Coats disease associated with Takayasu arteritis.