例 1 　 男 ,46岁。因左耳间断性疼痛 1 0年 ,左耳前肿物 3年入院。左耳屏处可触及一约 5 cm× 3cm× 3 cm大小的肿物 ,质地硬 ,触痛明显。乳突 X线片及乳突 CT均示无骨质破坏。 1 989年 5月行左外耳道肿物切除及乳突根治术。术后病理诊断腺样囊性癌。术后 1年患者因左耳道前壁 Example 1 male, 46 years old. Intermittent pain due to left ear 10 years, 3 years before the left ear tumor admission. The left tragus can reach a size of about 5 cm × 3 cm × 3 cm of the tumor, hard texture, tenderness significantly. Mastoid X-ray and mastoid CT showed no bone destruction. In May 1989, the left external auditory canal resection and mastoidectomy. Postoperative pathological diagnosis of adenoid cystic carcinoma. One year after surgery due to the left ear canal anterior wall