Fig. 1

a–c On the 8th day, thrombi appeared in the right external jugular vein, bilateral internal jugular veins, and the right small saphenous vein. d, e On the 10th day, a left hemothorax appeared, and the left parotid gland (blue arrow), near the pterygoid muscle group (yellow arrow) and masseter muscle (green arrow), was enlarged. A slightly low internal absorption, suggesting abscess formation, was also observed. f Posterior echogenic enhancement with a well-defined border and heterogeneous internal echogenicity of about 37 × 35 mm near the left parotid gland, with findings showing an abscess after superficial ultrasound examination of the left parotid gland