A Rare Stapes Abnormality

Table 1

Classification of congenital ossicular malformations (adapted from Teunissen and Cremers [10]).

Class I	Isolated stapes footplate fixation
Class II	Stapes fixation in combination with a congenital anomaly of the ossicular chain
Class III	Anomalies of the ossicular chain and mobile stapes footplate
Class IV	With aplasia or severe dysplasia of the oval window or round window