PMC4327553_01
CT soft tissue window showing an iso-hypodense nodular mass in the right parapharyngeal space.
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F1
The mass was well defined, showing moderate enhancement following intravenous contrast injection (fig. 1).
CT soft tissue window after intravenous injection showing moderate enhancement and displacement of the cervical great vessels.
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F2
It displaced the anterior and medial internal carotid arteries and the internal jugular vein (fig. 2).
MRI T1 sequence: hypointense signal of the solid mass.
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F3
A hypointense signal was seen on the T1 sequence (fig. 3), and a hyperintense signal was seen on the STIR image (fig. 4).
Gadolinium-enhanced and fat-saturated MRI T1, axial view: moderate peripheral enhancement.
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F5
A moderate peripheral enhancement was observed after an intravenous injection of paramagnetic contrast material (fig. 5, fig. 6).
HE staining.
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F7
Subsequently, a biopsy confirmed a 'fragment of acinic cell carcinoma' (fig. 7, fig. 8).