Microtia (which means small ears) is an external ear deformity that is a condition of birth. Ninety percent of patients with microtia are affected on only one ear, although there are cases where both ears are affected, and boys are more likely to have microtia than girls. In cases of unilateral microtia, the right ear is more likely to be affected than the left ear. The worldwide prevalence varies from 0.83/10,000 to 17.4/10,000. Microtia can be classified into four grades: Grade 1: There is a relatively small ear with a visible ear configuration and a narrow, but really present, ear canal. Grade 2: Has only part or half of the outer ear with a blocked or narrow outer ear canal that causes conductive hearing loss. Grade 3: There is no outer ear at all, with only remnants of structures as large as peanuts on the surface, and no outer ear canal or eardrum at all. Grade 4: complete absence of the ear.