Practical small animal ultrasound bits and pieces: part II…. tracheal exudate sign
And the same in video:
This is a useful finding: it implies airway exudate. If you see this in a coughing patient and transthoracic lung ultrasound is unremarkable, there is likely significant airway disease. Differential diagnoses associated with this might include, for example, eosinophilic bronchopneumopathy, infectious tracheo-bronchitis, bleeding due to coagulopathy, bronchial foreign body.
Also another good reason to scan the neck in every patient! Always useful to have a handle on the appearance of the trachea, thyroids, parathyroids, cervical nodes and oesophagus.