腮腺基底细胞腺瘤的CT表现与鉴别诊断

CT manifestations and differential diagnosis of basal cell adenomas of the parotid gland

目的:探讨腮腺基底细胞腺瘤(BCA)的CT表现特点。方法:回顾性分析经手术病理证实的9例腮腺BCA病例的CT资料,对病变的部位、形态、大小、数目、CT平扫和双期增强特征进行分析,并与同期搜集的31例腮腺多形性腺瘤和19例腮腺腺淋巴瘤进行比较。结果:9例BCA均为单发病灶,6例位于腮腺浅叶,3例病灶跨浅叶及深叶。病灶均边缘清楚,4例肿瘤内见囊变,其中3例囊变区≥50%,1例瘤体边缘见弧形钙化。所有病例增强双期均显著强化,动脉期BCA增强幅度高于多形性腺瘤,静脉期BCA增强幅度高于多形性腺瘤和腺淋巴瘤,两者差异均有统计学意义(P<0.01)。结论:腮腺BCA的CT表现具有一定特征性,结合临床特点有助于作出定性诊断。

Objective：To investigate the CT manifestations of basal cell adenoma （BCA） of the parotid gland. Meth- ods：CT features of 9 patients with BCA of the parotid gland confirmed by surgery and pathology were retrospectively ana- lyzed. The location,shape, size, number, CT features without and with dual-phase enhancement of the lesions were studied and CT characteristics were compared with that of pleomorphic adenoma （n=31） and adenolymphoma （n=19） in the same period. Results：All 9 patients had solitary BAC lesion,which located at the superficial lobe of parotid gland （n 6） and in volved both the superficial and deep lobe （n=3）. The lesions were all well-defined. Cystic degeneration was displayed in 4 lesions,among them, cystic areas was≥50% in 3 lesions. One lesion had curvilinear calcification at the edge of tumor. All lesions were significantly enhanced, enhancement of BCA was stronger than that of pleomorphic adenoma in arterial phase, and was stronger than that of pleomorphic adenoma and adenolymphoma in venous phase, with significant statistic differ ences （P〈0.01）. Conclusions：Certain characteristic CT manifestations could be revealed in BCA, which could contribute to make a specific diagnosis when in combination with clinical features.