Fig. 2

a On the 10th day, with the thrombus in the right external jugular vein and bilateral internal jugular veins, described 2 days before, the left parotid gland, pterygoid muscle group, and masseter muscle were enlarged, as shown by CECT. Induration of the left parotid gland was also observed. However, no swelling of the left parotid region on visual examination was detected. b On the 16th day, although swelling of the left parotid gland became prominent, no skin redness, inflammation of the buccal mucosa, or drainage of pus from the Stenon duct was observed. c On the 41st day, the swelling in the left parotid gland area disappeared