MRI对腮腺肿瘤的诊断价值

MRI diagnosis of parotid gland tumors

目的探讨MRI对腮腺肿瘤的诊断价值，提高对腮腺肿瘤的认识。方法回顾性分析经病理证实的62例腮腺肿瘤的MRI影像学表现。全部行轴位T1WI及T2WI、冠状位T2WI脂肪抑制、矢状位T，WI及轴位DWI（b值取0和1000s／mm2）扫描，并经工作站自动生成ADC图。结果多形性腺瘤31例，全部单发；腺淋巴瘤19例，9例单发，10例多发，共30个病灶；恶性肿瘤12例，其中黏液表皮样癌6例，淋巴瘤3例，涎腺导管癌3例，3例淋巴瘤为多发，其余均为单发，共18个病灶。腮腺良性肿瘤发生于腮腺浅叶者多见（43／51），恶性肿瘤以深叶多见（8／18）；良性肿瘤体积一般较恶性肿瘤小；良性肿瘤一般边界清楚，恶性肿瘤边界可清楚或不清；恶性肿瘤大多伴有颈部淋巴结肿大（10／12）；腺淋巴瘤与恶性肿瘤DWI均呈高信号，信号高于多形性腺瘤，但腺淋巴瘤AI）C值（0．92×10-3mm2／s）明显低于恶性肿瘤（1．19×10-3mm2／s，P〈0．05）。结论腮腺肿瘤MRI表现有一定的特点，MRI检查能为常见腮腺肿瘤的诊断及鉴别诊断提供依据。

Objective To evaluate the value of MRI in the diagnosis of parotid tumors, in order to improve the awareness of parotid tumor. Methods A retrospective study was performed on 62 cases of parotid tumors, which were confirmed by histopathology. All of them were performed T1 - weighted and T2 -weighted, fat- suppressed coronal T2 -weighted and diffusion -weighted MRI examinations, ADC map were automated generated by our workstation. Results Thirty - one cases were pleomorphie ade- nomas, 19 were warthin tumors, and the others were malignant tumors. There were 79 tumors in all, 10 warthin tumors and 3 lymphomas appeared in both sides or several tumors in one side, others ap- peared solitary tumor. There were more benign tumors in the superficial lobe （43/51 ） , but more ma- lignant tumors located in the deep lobe （8/18） and larger than benign tumors. Bengin tumors showed well defined margin, while malignant tumors showed partially unclear or invasive margins. All war- thin tumors and malignant tumors had high signal intensity on diffusion - weighted images, but the mean ADC value of warthin tumors （0.92 × 10-3 mm2/s） was significantly lower （ P 〈 0.05 ） than that of malignant parotid tumors （ 1. 19×10-3mm2/s）. Conclusions There are some MRI eharacteristics in different parotid tumors, MRI examination plays an important role in the diagnosis and differentiating diagnosis of pa- rotid tumors.