Continued...

View Case D

Interpretation of Case D :

• Bony Alignment: Normal.
  
  
• Vertebral bodies and disk spaces: Normal sizes. Not able to fully see C7.
  
  
• C1-C2: Probably normal, difficult to see.
  
  
• Positioning: Extension.
  
  
• Prevertebral space: Borderline widening. It is slightly less wide than the width of a vertebral body. It is clearly wider than half of a vertebral body.
  
  
• Epiglottis: Thin. The pre-epiglottic space is normal.
  
  
• Subglottic airway size: Image is too dark to see this. Impression: Possible early retropharyngeal abscess.
  
  

View Case E

Interpretation of Case E :

• Bony Alignment: Abnormal. Note the malalignment of the posterior borders of the vertebral bodies. C2 is anterior relative to C3.
  
  
• Vertebral bodies and disk spaces: Normal sizes.
  
  
• C1-C2: Normal.
  
  
• Positioning: Flexion.
  
  
• Prevertebral space: Not widened.
  
  
• Epiglottis: Not included in this view.
  
  
• Subglottic airway size: Not able to fully see the airway in this view. Impression: Pseudosubluxation C2 on C3. Case 5 in Volume 1
  reviewed this image. Recall that films taken in flexion are likely to show this C2/C3 pseudosubluxation. This is distinguished from a hangman's fracture by the Swischuk line drawn between the anterior margin of the vertebral arches of C1 and C3. This line should touch the anterior margin of the vertebral arch of C2 or come within 1 mm of it (see Volume 1, Case 5).