Figure 3
A: Low density shadow and gas shadow in cervical subcutaneous space, parapharyngeal space, retropharyngeal space, prevertebral space and carotid space
B: Swelling of soft tissue around sternal stalk and anterior mediastinum with fluid sonolucent area and pneumatosis
C: Necrotic fascia of sternocleidomastoid muscle
D: The necrotic tissue was removed and the pus cavity was flushed
E: An oxygen tube was placed in the pus cavity
F: The pus cavity was sutured and negative pressure drainage was placed
G: The re-examination result of CT showed that the pus cavity disappeared and the swelling of soft tissue subsided
H: The drainage tube was removed and the incision healed well