Saito Chizu, Kanazawa Takeharu, Yamaguchi Takehiko, Nakamura Ken-Ichi, Ichimura Keiichi
Department of Otolaryngology/Head and Neck Surgery, School of Medicine, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan.
Department of Otolaryngology/Head and Neck Surgery, School of Medicine, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan ; Department of Otolaryngology, Shin-Oyama City Hospital, 1-1-5 Wakagi-cho, Oyama 323-0028, Japan.
Case Rep Otolaryngol. 2014;2014:975151. doi: 10.1155/2014/975151. Epub 2014 Apr 7.
Background. Pleomorphic adenoma (PA) is a benign tumour that mainly arises from salivary glands, and PA of the external auditory canal (EAC) is very rare. The objective of this study was to clarify the clinical presentation and treatment of PA of the EAC. Method. The authors present a case of PA arising from the EAC together with a literature review. Results. A 40-year-old man complained of hearing loss and foreign-body sensation of the right ear. Clinical and radiological examinations revealed a well-defined tumour limited to the EAC, with no connection to the parotid gland. Preoperative fine-needle aspiration cytology findings were characteristic of PA. The tumour was removed en bloc with the overlying skin. Conclusion. PA of the EAC is very rare, and methods to rule out malignancy before treatment are lacking. Thus, long-term follow-up is necessary, because malignant tumours are common in the EAC and PA has malignant potential.
背景。多形性腺瘤（PA）是一种主要起源于唾液腺的良性肿瘤，而外耳道（EAC）的多形性腺瘤非常罕见。本研究的目的是阐明EAC多形性腺瘤的临床表现及治疗方法。方法。作者报告1例起源于EAC的多形性腺瘤病例并进行文献复习。结果。一名40岁男性主诉右耳听力减退及异物感。临床及影像学检查显示肿瘤边界清晰，局限于EAC，与腮腺无关联。术前细针穿刺细胞学检查结果具有PA的特征性表现。肿瘤与覆盖其上的皮肤一并整块切除。结论。EAC的PA非常罕见，且缺乏治疗前排除恶性肿瘤的方法。因此，由于EAC中恶性肿瘤常见且PA具有恶变潜能，长期随访是必要的。
