Which imaging study is the gold standard for diagnosing a retropharyngeal abscess?

• A. CBC with differential
• B. Fever and a muffled voice on examination
• C. CT of the neck with contrast
• D. History of a recent throat infection

Answer: (C)

When a retropharyngeal abscess is suspected, imaging is essential to confirm the diagnosis and map the infection for treatment planning. The best imaging study is a CT scan of the neck with IV contrast. It provides detailed cross-sectional views of the retropharyngeal space and can reveal a fluid collection with rim enhancement that indicates an abscess. The contrast helps distinguish an abscess from cellulitis (where swelling occurs without a distinct collection), and it shows the size and exact location, as well as any airway compression or spread to surrounding spaces. This information is crucial for deciding whether surgical drainage is needed and for planning the approach.

Labs like CBC with differential or clinical signs such as fever or a muffled voice can raise suspicion but do not confirm the diagnosis or delineate the extent of the infection. A history of a throat infection is a risk factor but is not diagnostic by itself.