颌下腺多形性腺瘤的MRI诊断

MRI diagnosis of submandibular gland pleomorphic adenoma

目的探讨颌下腺多形性腺瘤的MRI特征。方法回顾性分析28例经病理证实的颌下腺多形性腺瘤的MRI表现。结果病灶均为单侧。单发27例,多发1例。位于腺体内27例,腺体外1例。呈类圆形或椭圆形25例,分叶状3例。病灶最大径1.2~5.8 cm,平均2.4 cm。平扫时病灶T1呈等或低信号25例,稍高信号3例。T2均呈等或高信号,信号均匀12例,不均匀16例。增强后病灶轻、中度强化,强化较均匀9例,不均匀16例,环形强化2例,1例未做增强扫描。结论颌下腺多形性腺瘤的MRI表现有一定的特征,MRI对颌下腺多形性腺瘤的诊断有较高的价值。

Objective To investigate the MRI findings of submandibular gland pleomorphic adenoma. Methods The clinical data and MRI findings of 28 patients with pathologically confirmed submandibular gland pleo- morphie adenoma were analyzed retrospectively. Results All cases had unilateral lesion. 27 cases had solitary lesion and 1 case had multiple lesion. The lesion appeared as an internal mass in 27 cases and as an exophytic mass in 1 case. The mass was round or elliptic in 25 cases and lobulated in 3 cases. The tumor diameter ranged from 1.2 cm to 5.8 cm with a mean value of 2.4 cm. 25 lesions showed low or equal signal intensity on T^WI and 3 lesions showed slightly higher intensity. 28 lesions showed equal or high signal intensity on T2WI, 12 cases showed uniform signal intensity and 16 cases showed uneven intensity. On contrast enhanced M1LI, all tumors manifested mild to moderate homoge- nous enhancement, 9 cases showed uniform enhancement and 16 cases showed uneven enhancement and 2 cases showed circinate enhancement. Conclusion MR/findings of submandibular gland pleomorphic adenorna are rela- tively specific, and hence MRI maybe have important diagnostic values in submandibular gland pleomorphic adenoma.