Retropharyngeal Abscess Examination Findings
The key examination findings in retropharyngeal abscess include bulging of the posterior pharyngeal wall, limitation of neck extension (inability to look up), fever, odynophagia, and torticollis. 1, 2
Cardinal Physical Examination Findings
Oropharyngeal Examination
- Bulging of the posterior wall of the oropharynx - This is the most characteristic finding, present in all documented cases 1
- Anterior displacement of the posterior pharyngeal wall 3
- Tonsillopharyngeal erythema (may be present but less specific)
Neck Examination
- Limitation of neck extension (45% of cases) - patients have difficulty extending their neck to look up 2
- Torticollis (36.5% of cases) 2
- Limitation of neck flexion (12.5% of cases) 2
- Swelling of the retropharyngeal area 4
- Painful mass in the anterior cervical region (when extension occurs) 5
Associated Symptoms
- Fever - commonly present 1
- Odynophagia (painful swallowing) - nearly universal 3, 1, 5
- Trismus (difficulty opening mouth) 1
- Excessive salivation 4
- Difficulty swallowing saliva in severe cases 5
Important Clinical Pitfalls
Respiratory distress and stridor are RARE presenting features - only 1.5-5% of cases present with stridor or wheezing 2. Do not wait for respiratory symptoms to make the diagnosis, as their absence does not exclude retropharyngeal abscess.
The head and neck may be held in an extended position to relieve pressure 4. This is a compensatory posture that should raise suspicion.
Confirmatory Imaging
While physical examination findings are suggestive, CT scan is essential for definitive diagnosis and should be performed in all suspected cases 6, 5. The physical examination alone cannot reliably distinguish retropharyngeal abscess from retropharyngeal cellulitis 2.
Lateral neck radiography showing prevertebral soft tissue thickening supports the diagnosis but is less definitive than CT 1.
Age-Related Considerations
In children (75% of cases occur under age 5), the classic triad is more reliable 2. In adults, retropharyngeal abscess is rare and often occurs in immunocompromised patients or following foreign body ingestion 1. Adult presentations may be more subtle, requiring higher clinical suspicion.