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目的 回顾性分析腮腺腺淋巴瘤MRI表现,总结其T2WI信号特点,并与病理对照,探讨T2WI低信号点征或裂隙征的诊断价值.方法 搜集经手术切除并经病理证实的19例腮腺腺淋巴瘤及15例多形性腺瘤的MRI资料,均行T1 WI、T2WI常规扫描及T2WI抑脂序列扫描,对比分析两组疾病T2WI信号特点,并与病理大体标本及镜下切片对比.结果 19例腮腺腺淋巴瘤中发现23个病灶,T1WI呈低信号,T2WI及抑脂T2WI呈低、高混杂信号,其中病灶内见明显低信号灶11例(58％),9例位于边缘部,2例位于中心,形态不规则,呈多发斑点状(8例),裂隙状(3例);可伴发囊变,以长T1、长T2信号为主,少数呈短T1、长T2信号;大体标本呈不规则点片状、裂隙状淡黄色区域,镜下为红染囊变区,囊腔内充填无定形坏死物,含脱落上皮、分泌物、细胞成分及胆固醇结晶等多种成分;15例多形性腺瘤均为单发,表现为T1WI呈低信号,T2WI呈等、高信号,无腺淋巴瘤所见的T2WI极低信号灶.结论 腮腺腺淋巴瘤T2WI病灶内明显低信号裂隙征具有一定特征性,有助于肿瘤的诊断、鉴别诊断.“,”Objective To retrospectively analyze the MRI appearances of parotid adenolymphomas,to summarize its T2WI signal characteristics,to compare imaging features with the pathology findings,and to evaluate T2WI low signal point sign or fissure sign in diagnosing parotid adenolymphomas.Methods A total of 19 cases with pathologically-proved parotid adenolymphoma and 15 cases with pathologically-proved pleomorphic adenolymphoma were enrolled in this study.Conventional T1 WI and T2WI scanning and T2WI with FLAIR sequence were performed in all patients.The T2WI signal characteristics were compared between the two groups,and the manifestations were compared with pathological findings.Results In 19 cases with parotid adenolymphoma,a total of 23 lesions were found,including single lesion (n =15),unilateral multiple lesions (n =1) and bilateral multiple lesions (n =3).Most adenolymphomas (15/19,78.9％) were located at the posterior and inferior quadrant.Parotid adenolymphoma presented as low signal on T1 WI and inhomogeneous hypoand hyper-signals on T2WI,among which obviously low signal was seen in 11 cases (58％).Of the 11 cases,the lesion was located at the peripheral region (n =9) or at the center (n =2).The lesions were irregular in shape,presenting as mottled (n =8) or crack form (n =3).Cystic degeneration could be seen,presenting as long T1 and long T2 signals in most cases or short T1 and long T2 signals in a few cases.Macroscopically,the lesion was manifested as irregular yellowish patch or crack areas,which,microscopically,was characterized by red cystic degeneration sites containing exfoliated epithelial secretions,deciduous cells,cholesterol crystals,etc.In all the 15 cases with pleomorphic adenomas,the lesion was single,presenting as low signal on T1 WI,iso-or hyper-signal on T2 WI,and no extreme low signal on T2 WI as seen in adenolymphoma was observed.Conclusion The low signal point sign or fissure sign on T2WI is a characteristic manifestation of parotid adenolymphoma,which is helpful in making diagnosis and differentiation.