Figure 1: Coronal, sagittal, and transverse section images of DNM in the neck and thorax CT of the patient (a). Free air images within retropharyngeal abscess; (b). Retropharyngeal abscess and mediastinitis, sagittal view; (c). Free air images in the mediastinal area and increased density in adipose tissue; (d). Increased density in mediastinal adipose tissue) (arrows). CT: Computed tomography, DNM: Descending necrotizing mediastinitis