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当前学科：口腔组织病理学
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患者女，72岁，左腮腺肿物2年，无痛性生长。检查见左侧腮腺区一1.5cm×1.2cm×1.2cm大小肿物，边界不清楚，与周围组织粘连。病理检查见肿物包膜不完整，切面实性，可见散在小囊腔。镜下见肿瘤由杯状黏液细胞、多边形表皮样细胞和基底样细胞组成。应诊断为（）
A . 腺样囊性癌
B . 腺泡细胞癌
C . 腺淋巴瘤
D . 多形性腺瘤
E . 黏液表皮样癌
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