Kamakura Takefumi, Horii Arata, Mishiro Yasuo, Takashima Shodayu, Kubo Takeshi
Department of Otolaryngology, Osaka University Medical School, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
Auris Nasus Larynx. 2006 Mar;33(1):53-6. doi: 10.1016/j.anl.2005.07.011. Epub 2005 Sep 15.
Syringocystadenoma papilliferum (SCAP) usually occurs on the face or the scalp and is very rare in the external auditory canal (EAC). There has been no information on magnetic resonance (MR) imaging of this tumor irrespective of its site. We report here a case of 57-year-old man having this tumor, which was surgically removed and its histopathology was confirmed. MR imaging demonstrated a lobulated 4-cm mass with clearly defined margins in the EAC. Although the tumor was bulky, these MR findings were different from the malignancies. The mass lesion showed intermediate signal intensity both on T1- and T2-weighted MR images and showed slight enhancement on gadolinium-enhanced T1-weighted images. Signal intensities on T2-weighted images of this tumor were low compared to those of pleomorphic adenoma. All ceruminous gland tumors including SCAP are thought to be potentially malignant; therefore, pre-operative biopsy should not be performed. Even though incisional biopsy is sometimes needed as in our case, the current MR features would be helpful for differential diagnosis of this rare condition and assessing the extension of the tumor.
乳头状囊腺瘤（SCAP）通常发生于面部或头皮，在外耳道（EAC）极为罕见。无论肿瘤位于何处，均无关于该肿瘤磁共振（MR）成像的相关信息。我们在此报告一例57岁男性患有此肿瘤，该肿瘤经手术切除，其组织病理学得到证实。MR成像显示在EAC内有一个分叶状的4厘米肿块，边界清晰。尽管肿瘤体积较大，但这些MR表现与恶性肿瘤不同。肿块病变在T1加权和T2加权MR图像上均表现为中等信号强度，在钆增强T1加权图像上表现为轻度强化。与多形性腺瘤相比，该肿瘤在T2加权图像上的信号强度较低。包括SCAP在内的所有耵聍腺肿瘤都被认为具有潜在恶性；因此，不应进行术前活检。尽管在我们的病例中有时需要进行切开活检，但目前的MR特征将有助于对这种罕见疾病进行鉴别诊断并评估肿瘤的范围。
