Zunaira saleh2 days ago

Odontogenic infection pathway

The retropharyngeal and the alar fascia fuse at a variable level between the C6 and T4 vertebrae, which forms a pouch at the inferior extent of the retropharyngeal space. If infection passes through the alar fascia to the danger space, the posterosuperior mediastinum will most likely soon become involved. The inferior boundary of the danger space is the diaphragm, which puts the entire mediastinum at risk.