外耳道胆脂瘤可造成严重的骨质破坏 ,导致听力下降 ,为能早期诊治 ,现将 1990至 1999年诊治的 4例报道如下。1　临床资料　　例 1,男 ,45岁。因左耳有阻塞感伴流粘液月余 ,于 1999年 6月收住院。患者年幼时有左耳流脓史 ,经抗炎治疗后痊愈。 1月前觉左耳闷、有堵塞感、听力下降 External auditory canal cholesteatoma can cause severe bone destruction, leading to hearing loss, in order to early diagnosis and treatment, now the diagnosis and treatment of 4 cases from 1990 to 1999 are as follows. 1 clinical data example 1, male, 45 years old. Because of the left ear obstruction with a sense of mucus more than a month, in June 1999 admitted to hospital. When young patients with left ear pus history, after anti-inflammatory treatment recovered. 1 month ago feel left nausea, a sense of blockage, hearing loss