Authors analysed the CT findings of the congenital ear anomalies of thirty-nine patients for 3 years and 6 months.
The results were as follows;
1. Most of the patients were under the age of 20 (87.1%) and prevalent in male (79.4%).
2. Clinically, congenital ear anomalies were detected in 30 patients, conductive hearing loss in 4, sensorineural hearing loss in 1, and the remained 4 patients were detected incidentally without clinical symptom.
3. In the cases of unilateral involvement of 30 patients, right ear was more common (18/20). Eight of 9 bilateral involvement showed similar degree.
4. The middle ear malformations were found in 32 patients and bilateral in 4 patients. 36 cases of middle ear malformations had been classified by Frey into 4 groups; Group Ⅰ in 6, Group Ⅱ in 13, Group Ⅲ in 13 and Group Ⅳ in 4.
5. Incidentally found ear anomaly was lateral semicircular canal formed a single cavity with the vestibule in all patients (5 patiants).
6. Inner ear malformations accompanying sensorineural hearing loss were found in 3 patients with bilateral involvement and middle ear malformations were accompanied in 2 patients. The degree of involvement of labyrinth was variable.
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