On CT or MRI many malignant tumors such as acinic cell carcinomas or low-grade mucoepidermoid carcinomas appear indistinguishable from benign tumors such as pleomorphic adenomas.

• 对CT或MRI ，许多恶性肿瘤，如腺泡细胞癌或低度粘液癌，好像不易区分良性肿瘤，如多形性腺瘤。