More common anomalies of the external
& middle ear
Atresia/stenosis of the EAC (tympanic ring dysplasia/aplasia) - atresia plate with fusion of neck of malleus to plate & variable development of ossicles and middle ear cavity.
First (mandibular) branchial arch dysplasia - maldevelopment of the malleus, incus& mandible
Second (hyoid) branchial arch dysplasia - maldevelopment of the stapes and footplate, styloid process and superior cornu of the hyoid bone; also anterior migration of the facial nerve canal within the petrous bone.