Pediatric emergency medicine trisk 3599 3599
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FIGURE 112.20 Effects of inspiration and positioning on prevertebral (retropharyngeal) soft
tissues. A: Increased prevertebral space (asterisk ) with expiration. B: Repeat radiograph in the
same patient during inspiration reveals normal prevertebral space with no suggestion of cervical
spine abnormality. C: Increased soft tissue space (arrow ) with expiratory phase of respiration.
D: Normal soft tissue space (arrow ) with inspiration in patient C . (A , B : Reprinted with
permission from Harris J, Edeiken-Monroe B. The Radiology of Acute Cervical Spine Trauma .
2nd ed. Baltimore, MD: Williams & Wilkins; 1987:6.)
