External Auditory Canal Aplasia/hypoplasia

A rare, otorhinolaryngological malformation characterized by failure in development of the external ear canal resulting in variable degree of malformations ranging from complete absence to mild stenosis and malformation of the middle ear. It is typically unilateral, it manifests with hearing loss on the affected side, and might be associated with microtia or hypoplastic pinna, an aberrant facial nerve course, and cholesteatoma.