Twenty-five(two) patients (45 ears) underwent CWD , the recidivism rate was 4%(1/25), the achieved rate of PTA was 72% (18/25).

• 有22例(25耳)进行了伴乳突根治的鼓室成形术,再发1耳,再发率4%25,听力改善率72%25(18/25)。