腮腺良性淋巴上皮病变的影像学特征

Imaging Characteristic of Benign Lymphoepithelial Lesion of Parotid Gland

目的分析腮腺良性淋巴上皮病变的MRI及CT成像影像特点。方法选择我院10例经手术病理证实的腮腺良性淋巴上皮病变患者,回顾性分析其MRI及CT平扫及增强表现,描述其影像学特征。结果双侧腮腺多发病变3例,单侧腮腺单发病变4例,双侧弥漫型病变3例。单发或多发结节型病变多位于腮腺浅叶、边缘近包膜下,主要呈楔形,大部尖端指向腮腺深叶。MRI主要特征为T2WI呈等或稍高于正常腮腺的信号,T2WI压脂序列病变呈高信号,常规增强扫描强化程度等或稍弱于正常腮腺,压脂增强强化程度稍高于或明显高于正常腮腺。CT主要特征为病变密度不均,见多发小囊变,可合并砂砾样钙化影。结论腮腺良性淋巴上皮病变影像学表现有一定的特点,可单发亦可多发或弥漫分布,常规T1WI及T2WI压脂序列最利于观察病变。

Objective To analyze the MRI and CT characteristic of parotid gland benign lymphoepithelial lesions.Methods Ten patients with benign lymphoepithelial lesions of parotid gland confirmed by operation and pathology were selected.The MRI or CT features of benign lymphoepithelial lesions of parotid gland were retrospectively analyzed.Results There were 3 cases of bilateral multiple parotid lesion,4 cases of unilateral solitary parotid lesions and 3 cases of bilateral diffuse lesions of both parotid glands.Most of single or multiple nodular lesions were located in the superficial lobe of the parotid gland,and located near the edge of the parotid gland under envelope,mainly wedge-shaped.The tip of most lesions all pointed to the deep lobe of the parotid gland.The major features of MRI showed equal or slightly higher signal than normal parotid gland on T1WI,and higher signal on T2WI fat saturation sequence as well.Enhanced degree of lesion on non-fat saturation sequence enhanced scanning was equal or slightly weaker and slightly or significantly higher after using fat saturation than normal parotid gland.The major features of CT were as follows,the density of lesions was uneven,cystic areas could be found,and partial lesion combined with multiple spots or gravel calcification.Conclusion BLEL of parotid gland have certain characteristics in imaging manifestation,which can be solitary,multiple or diffuse distribution.The T1WI and T2WI Fat saturation sequence are most beneficial for observing the lesions.