腮腺腺淋巴瘤的MRI诊断

Study on significance of MRI in diagnosis of adenolymphoma in parotid gland

目的探讨腮腺腺淋巴瘤的MRI表现及鉴别诊断。方法收集经手术病理证实的21例腮腺腺淋巴瘤患者资料,分析临床及MRI特点。结果 21例腮腺腺淋巴瘤患者中,男性18例,女性3例,年龄45～82岁,平均59岁,50岁以上17例(80.9%)。有吸烟史16例(76.0%)。21例患者24侧腮腺发病,共30个病灶。单侧单发16例,单侧多发2例,双侧多发3例,大多数(22个病灶占73.3%)肿瘤位于腮腺浅叶后下部。病灶多呈圆形或椭圆形,26个(86.7%)病灶边界清楚。病灶多呈T1WI稍低信号,T2WI呈稍低或稍高混杂信号,信号均匀或不均匀,增强后呈轻中度强化。结论中老年吸烟男性患者,腮腺浅叶后下部病灶,边界清楚,轻中度强化,尤其是多发或双侧发病者,应当首先考虑腺淋巴瘤。

Objective To explore the findings of MRI and its significance in differential diagnosis of adenolymphoma in parotid gland.Methods The findings of MRI and clinical features of 21 patients with adenolymphoma in parotid gland confirmed by surgery and pathological examination were collected and analyzed.Results Among 21 cases of adenolymphoma in parotid gland,18 were males and 3 were females with age range of 45 to 82 years old（with mean age of 59 years old）,and 17（80.9%） of them were over 50 years old and 16（76.2%） of them had smoking habit.A total of 30 lesions were found in the affected side of parotid glands,among these 21 cases included 16 cases with unilateral solitary mass,2 cases with unilateral multiple lesions,and 3 cases with bilateral multiple lesions.Most adenolymphoma（73.3%） located in lower superficial lobe of parotid gland.These lesions were round or oval in shape,and the borders of 26（86.7%） lesions were well-defined.The lesions had slightly low signal on T1WI and T2WI,and they were presented as homogeneous or heterogeneous intensity signals.Most lesions showed mild or moderate enhancement after contrast administration.Conclusion Adenolymphoma in parotid gland should be first considered in middle-aged males with lesions located in posterior and inferior lobe having well-defined shape,mild or moderate enhancement,especially they have smoking habit and lesions were multiple or bilaterally located.