Figure 2. Computed tomography of the neck on day 14 (A–C) and day 17 (D–F) of hospitalization. Plain computed tomography (CT) on day 14 of hospitalization showing enhanced soft tissue shadows (A) in the left sternocleidomastoid muscle and the left strap muscles (dot area), (B) around the left sternoclavicular joint (triangle), and (C) in the superior mediastinum (arrow). (D) Contrast-enhanced CT on day 17 of hospitalization showing abscess formation in the left sternocleidomastoid muscle and the left strap muscles (dot area). (E) The left sternoclavicular joint shows an increased concentration of surrounding adipose tissue without bone destruction (triangle). (F) The abscess has also reached the superior mediastinum on the dorsal side of the sternum (arrow).