Abstract：
OBJECTIVE: To summarize the ultrasound, CT and MRI manifestations of Warthin-like mucoepidermoid carcinoma (WT-MEC), and to explore its imaging characteristics, so as to provide reference for clinical and preoperative diagnosis.
METHODS: The clinical information and imaging data of ultrasound, CT and MRI of 12 patients with WT-MEC diagnosed by pathology in Shanghai Ninth People\'s Hospital, Shanghai Jiao Tong University School of Medicine from January 2017 to December 2021 were collected, and their specific characteristics were retrospectively summarized.
RESULTS: Among the 12 WT-MEC patients, there were 7 males and 5 females, with an average age of (42.7±16) years. Seven cases underwent ultrasound examination, 6 cases underwent CT examination, and 2 cases underwent MRI examination. Radiologically, all the lesions presented as a solitary mass. 11/12 lesions(91.7%) were identified as well-defined margins, and 10/12(83.3%) as solid-cystic masses. All solid-cystic lesions contained multiple cystic areas with variable sizes. On US images, most lesions showed mixed-echoic echogenicity(5/7, 71.4%), poor vascularization (6/7, 85.7%) and acoustic enhancement (6/7, 85.7%). CT revealed all the lesions (6/6, 100%) as a soft-tissue mass with heterogeneous enhancement (5/6, 83.3%). MRI imaging demonstrated the neoplasm with low or iso-signal intensity on plain T1WI and hyperintensity on T2WI. The heterogeneous enhancement was shown on contrast-enhanced T1WI.
CONCLUSIONS: Most WT-MECs represent as a solitary, well-defined, solid-cystic mass in the parotid gland. The neoplasm may be characterized by the multiple and variable-sized cystic components within the tumor.
METHODS: The clinical information and imaging data of ultrasound, CT and MRI of 12 patients with WT-MEC diagnosed by pathology in Shanghai Ninth People\'s Hospital, Shanghai Jiao Tong University School of Medicine from January 2017 to December 2021 were collected, and their specific characteristics were retrospectively summarized.
RESULTS: Among the 12 WT-MEC patients, there were 7 males and 5 females, with an average age of (42.7±16) years. Seven cases underwent ultrasound examination, 6 cases underwent CT examination, and 2 cases underwent MRI examination. Radiologically, all the lesions presented as a solitary mass. 11/12 lesions(91.7%) were identified as well-defined margins, and 10/12(83.3%) as solid-cystic masses. All solid-cystic lesions contained multiple cystic areas with variable sizes. On US images, most lesions showed mixed-echoic echogenicity(5/7, 71.4%), poor vascularization (6/7, 85.7%) and acoustic enhancement (6/7, 85.7%). CT revealed all the lesions (6/6, 100%) as a soft-tissue mass with heterogeneous enhancement (5/6, 83.3%). MRI imaging demonstrated the neoplasm with low or iso-signal intensity on plain T1WI and hyperintensity on T2WI. The heterogeneous enhancement was shown on contrast-enhanced T1WI.
CONCLUSIONS: Most WT-MECs represent as a solitary, well-defined, solid-cystic mass in the parotid gland. The neoplasm may be characterized by the multiple and variable-sized cystic components within the tumor.
摘要：
目的：总结超声，Warthin样黏液表皮样癌（WT-MEC）的CT和MRI表现，并探索其成像特征，从而为临床和术前诊断提供参考。
方法：超声的临床信息和影像学数据，12例经病理诊断为WT-MEC的CT和MRI在上海市第九人民医院，上海交通大学医学院于2017年1月至2021年12月,并对其具体特点进行回顾性总结。
结果：在12例WT-MEC患者中，有7名男性和5名女性，平均年龄(42.7±16)岁。7例接受超声检查，6例行CT检查,2例行MRI检查。放射学上,所有病变都表现为孤立性肿块.11/12病变（91.7%）被确定为界限明确的边缘，10/12（83.3%）为囊实性肿块。所有实囊性病变都包含多个大小可变的囊性区域。在美国图像上，大多数病变表现为混合回声回声(5/7，71.4%)，血管化不良（6/7，85.7％）和声学增强（6/7，85.7％）。CT显示所有病变（6/6，100％）为软组织肿块，异质性增强（5/6，83.3％）。MRI成像显示肿瘤在T1WI平面上具有低或等信号强度，在T2WI上具有高强度。在对比增强的T1WI上显示了异质增强。
结论：大多数WT-MEC代表单独的，定义明确，腮腺囊性实性肿块。肿瘤的特征可能在于肿瘤内的多个和可变大小的囊性成分。
方法：超声的临床信息和影像学数据，12例经病理诊断为WT-MEC的CT和MRI在上海市第九人民医院，上海交通大学医学院于2017年1月至2021年12月,并对其具体特点进行回顾性总结。
结果：在12例WT-MEC患者中，有7名男性和5名女性，平均年龄(42.7±16)岁。7例接受超声检查，6例行CT检查,2例行MRI检查。放射学上,所有病变都表现为孤立性肿块.11/12病变（91.7%）被确定为界限明确的边缘，10/12（83.3%）为囊实性肿块。所有实囊性病变都包含多个大小可变的囊性区域。在美国图像上，大多数病变表现为混合回声回声(5/7，71.4%)，血管化不良（6/7，85.7％）和声学增强（6/7，85.7％）。CT显示所有病变（6/6，100％）为软组织肿块，异质性增强（5/6，83.3％）。MRI成像显示肿瘤在T1WI平面上具有低或等信号强度，在T2WI上具有高强度。在对比增强的T1WI上显示了异质增强。
结论：大多数WT-MEC代表单独的，定义明确，腮腺囊性实性肿块。肿瘤的特征可能在于肿瘤内的多个和可变大小的囊性成分。
