Investigation of the sensitivity and specificity of radiological signs for diagnosis of periapical infection of equine cheek teeth.
Authors: Townsend N B, Hawkes C S, Rex R, Boden L A, Barakzai S Z
Journal: Equine veterinary journal
Summary
# Editorial Summary: Radiographic Diagnosis of Equine Cheek Teeth Infection Radiography remains the primary diagnostic tool for periapical infection in equine cheek teeth, yet clinicians have lacked evidence-based guidance on which radiographic signs are most reliable for diagnosis. Townsend and colleagues conducted a retrospective evaluation in which three independent clinicians blindly assessed computed radiographs of 41 infected and 41 control cheek teeth, scoring twelve predetermined radiographic signs and rendering a final diagnostic impression. Periapical sclerosis and periapical halo formation emerged as the most diagnostically valuable indicators, with median sensitivities of 73–90% across observers, whilst clubbing of roots also showed high sensitivity; multivariable analysis confirmed that severity of periapical sclerosis and extensive periapical halo were strongly associated with infection. Overall diagnostic accuracy reached 76% sensitivity and 90% specificity across the cohort, with computed radiography performing notably better than film radiography reported in earlier studies. These findings provide practitioners with a rational framework for interpreting cheek tooth radiographs, enabling more confident assessment of which radiographic changes warrant intervention and helping differentiate clinically significant disease from incidental anatomical variation.
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Practical Takeaways
- •When interpreting cheek tooth radiographs, the presence of periapical sclerosis and periapical halo formation are the most reliable individual signs of apical infection and should guide clinical decision-making
- •Computed radiography is a practical advancement offering improved sensitivity over traditional film radiography for identifying infected cheek teeth
- •A systematic evaluation of multiple radiographic signs together improves diagnostic accuracy compared to relying on single findings, so document and compare all available signs when assessing suspicious teeth
Key Findings
- •Median sensitivity and specificity for CT apical infection diagnosis were 76% and 90% respectively across three clinicians
- •Periapical sclerosis and periapical halo formation showed highest sensitivities (73-90%) but only moderate specificity (61-63%)
- •Severity of periapical sclerosis and extensive periapical halo were strongly associated with CT apical infection on multivariable analysis
- •Computed radiography demonstrated higher sensitivity but similar specificity compared to previous film radiography studies for detecting CT apical infection