Circumferential: Croup (Common), Subglottic stenosis, Paradoxic collapse with other glottic obstruction.
It is also done to see any compression or displacement of trachea by lateral neck masses, e.g.
This view is useful to differentiate a foreign body of larynx from that of oesophagus.
Importance of Anteroposterior (AP) view of neck:
Caries of cervical spine, associated with retropharyngeal abscess or osteophytes in cervical vertebrae or injuries of spine.
Compression of trachea by thyroid or retropharyngeal masses.
Fractures of larynx and hyoid bone and their displacement.
Position of tracheostomy tube, T-tube or laryngeal stent.
Foreign bodies of larynx, pharynx and upper oesophagus and to differentiate a foreign body of the airway from that of the food passage.
Hyoid bone and laryngeal cartilage ossifications Air column in subglottic space and tracheaĮ. If the patient’s neck is flexed and/or if the radiograph is obtained during end-expiration the prevertebral soft tissues may appear falsely widened and thus give the false impression of a possible retropharyngeal infection.ĭ. Schematic view of soft tissue lateral neck Step off: Normally, there is “step off” from the hypopharynx to the larynx. This is due to the soft tissue density of the undistended esophagus posterior to the tracheal air column. It is located directly posterior to the retropharyngeal space. Prevertebral space: A potential space that is located between the anterior aspect of the vertebral body and the prevertebral fascia. Retropharyngeal space: Extends from the base of the skull down to the level of the carina, and is located between the buccopharyngeal mucosa and the prevertebral fascia. False and true cords with ventricle in between them. Anatomy: Plain X-ray Soft tissue lateral view neck.
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