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case_images: Nasopharynx and neck MRI findings from 15 April 2019. (A-D) The axial planes of T1-weighted, enhanced T1-weighted, T2-weighted, and diffusion-weighted imaging (DWI) MRI of the nasopharynx, showing a 5.6 cm x 3.4 cm x 3.1 cm mass within the right parietal and lateral walls of the nasopharynx, accompanied by skull base bone invasion, invasion of the oropharyngeal lateral wall and right parapharyngeal space, the right medial pterygoid muscle, and the musculus longus capitis. (E, F) The axial planes of enhanced T1-weighted DWI MRI revealed enlargement of the right retropharyngeal lymph node. (G) The coronal plane of enhanced T1-weighted imaging showed tumor involvement with the cavernous sinus.
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case_images: Simultaneously, lymph node enlargement was found in the right retropharyngeal space ( Figure 1 ).
case_images: Pathological findings of the nasopharyngeal biopsy obtained on 17 April 2019. The EMCa of the nasopharynx was mainly composed of an inner layer of epithelial cells and an outer layer of clear cytoplasmic myoepithelial cells. H&E staining; magnification, x10 (A) and x40 (B). EMCa, epithelial-myoepithelial carcinoma; H&E, hematoxylin and eosin.
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case_images: Hematoxylin and eosin staining showed a classical biphasic pattern with typical epithelial cells and myoepithelial cells ( Figure 2 ) without nerve invasion or vascular cancer embolus.