Fig. 2. Patient’s neck ultrasonography (US) during the treatment course. (A, B) Neck US transverse and longitudinal view show a heterogeneous hypoechoic mass of 1.4×0.7×1.2 cm in size at the right lower pole on Day 4 with anterior neck soft tissue swelling. (C, D) Neck US transverse and longitudinal view show a decrease in size (0.6×1.2× 0.75 cm) of the hypoechoic mass in the right lower pole with improvement of anterior neck soft tissue swelling after 2 months.
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