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Four cases of atresia auris are described, in which the atresia was only based on an abnormality in the chain of auditory ossicles. This possibility should be borne in mind when one is dealing with an unexplained conduction deafness existing since childhood. The name of atresia auris minima is suggested for this group. For some cases an operative technique, called by the author “reconstruction of the hammerhead columella”, is recommended.
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G. Ardine de Wit (1958) studied this question.
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