Membranous band between the tympanic membrane and the external auditory canal

Abstract Two cases of a membranous band between the tympanic membrane and the external auditory canal are presented. These characteristic structures are rare, but observed in several first branchial cleft anomalies. Neither patient presented with an infection. In Case 1 , an eleven-year-old girl has this structure in her right ear. In Case 2 , a thirteen-year-old boy has this structure in his left ear. Both patients demonstrated slight air-bone gaps in the affected ear with a pure-tone audiometric test, due to limited vibrations of the tympanic membrane.