涎腺肌上皮瘤的CT和MRI表现  

Imaging Findings and Differential Diagnosis of Myoepithelioma of Salivary Glands

作　　者：赵海[1] 高明勇[1] 徐志峰[1] 申小明[1] 梁雪梅[1] 张志花[1] 

机构地区：[1]广东省佛山市第一人民医院影像科,528000

出　　处：《临床放射学杂志》2015年第8期1212-1214,共3页Journal of Clinical Radiology

摘　　要：目的探讨涎腺来源的肌上皮瘤(ME)的影像学特点。方法搜集19例经手术病理证实的ME患者术前CT(n=11)和MR(n=8)平扫及增强扫描资料。由两名高年资影像诊断医师分别阅片,确定病变范围、密度/信号特征和强化特征,并与手术病理对照。结果 19例中,良性12例,恶性7例。位于腮腺8例,腭部3例,鼻腔2例,颞下窝2例,咽旁间隙1例,上颌窦腔1例,牙龈1例,鼻咽1例。15例为膨胀性生长,4例为浸润性生长。11例CT图像上肿块为中等软组织密度,其中3例密度均匀,8例内可见低密度囊变、坏死区,1例可见环形钙化灶。8例MRI图像上肿块实性成分T1WI呈稍低信号,T2WI呈稍高或高信号,信号多不均匀,肿块内坏死、囊变区,周围有包膜结构。增强扫描:11例为明显均匀、不均匀性强化,6例为中度强化,2例为明显环形强化。恶性ME包膜不完整或缺如,部分伴周围结构侵犯。结论涎腺ME的CT与MRI表现具有一定的特征性,主要表现为涎腺区边界清楚的囊实性肿块,尤其位于腮腺浅叶,有包膜,实性成分强化较明显。当肿瘤包膜不完整,有周围结构受侵犯时,应考虑恶性ME。Objective Exploring the imaging features of myoepithelioma of salivary glands,to improve the diagnostic rate. Methods All 19 cases of patients with myoepithelioma confirmed by surgical pathology,Plain MR and enhanced examination was performed in 8 of them,others was performed by plain CT and enhanced examination. the CT and MR data were reviewed and analysed retrospectively in comparison with surgical and pathological results. Results In 19 myoepitheliomas,12 were benign,7were malignant; parotid 8,palate3,nasal cavity2,infratemporal fossa 2,parapharyngeal space1,maxillary sinus 1,gum 1,nasopharynx 1。11 CT plain were isodensity,. The density of 3 lesions were homogeneous,others 8 lesions showed cystic degneration or necrosis,1 case of annular calcification. All 8 cases of MR showed hypointensity on T1 WI and hyperintensity on T2 WI. 11 lesions showed marked enhancement,6 lesions showed moderate enhancement,2 lesions showed circular enhancement. Malignant myoepithelioma were without intact membrane and invasion of the surrounding structures. Conclusion Certain imaging diagnostic characteristics of ME were demonstrated with CT and MRI,it was helpful in the diagnosis.

关 键 词：肌上皮瘤 涎腺 体层摄影术 X线计算机 磁共振成像 

分 类 号：R739.8[医药卫生—肿瘤] R445.2[医药卫生—临床医学] R730.44