Sensitivity and specificity of 3 Tesla magnetic resonance imaging and multidetector computed tomographic tenography to identify artificially induced soft tissue lesions in the equine cadaveric digital flexor tendon sheath
Authors: Aßmann Anton D., Ohlerth Stefanie, Torgerson Paul R., Bischofberger Andrea S.
Journal: Equine Veterinary Education
Summary
# Editorial Summary Tenovaginitis of the digital flexor tendon sheath remains a significant diagnostic challenge in equine lameness work, with conventional ultrasound and contrast tenography offering limited specificity for identifying discrete soft tissue lesions. Researchers at the University of Zurich created 52 standardised artificial lesions (10–20 mm length, 3–5 mm depth) across the superficial and deep digital flexor tendons, manica flexoria, and proximal scutum in 19 cadaveric distal limbs, then evaluated 3 Tesla MRI and multidetector computed tomographic tenography (CTT) against direct visual reference. Both modalities demonstrated good to excellent performance overall, with CTT and MRI showing comparable sensitivity and specificity for superficial digital flexor tendon (75% vs 85%) and manica flexoria lesions (96% for both), though MRI proved superior for deep digital flexor tendon (62% vs 38% sensitivity) and proximal scutum lesions (93% vs 57% sensitivity). For practitioners, these findings suggest CTT represents a viable alternative to MRI for detecting manica flexoria pathology—clinically valuable given CTT's greater accessibility, lower cost, and shorter acquisition times—whilst MRI remains the modality of choice when deep tendon or proximal sheath involvement is suspected. The study's primary limitation lies in using small, artificially created lesions in cadaverous tissue, meaning results may not fully translate to chronic, irregular, or larger naturally occurring lesions encountered in clinical practice.
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Practical Takeaways
- •Both MRI and CTT are reliable imaging modalities for DFTS pathology; choice may depend on availability and lesion location suspected
- •MRI should be preferred when DDFT or proximal scutum involvement is suspected, as it showed superior sensitivity for these structures
- •CTT offers a promising alternative for detecting manica flexoria lesions and may be more accessible or cost-effective in some settings
Key Findings
- •MRI and CTT showed similar sensitivity for SDFT lesions (85% vs 75%) and identical specificity for MF lesions (96% for both)
- •MRI demonstrated higher sensitivity for DDFT lesions (62% vs 38%) and proximal scutum lesions (93% vs 57%) compared to CTT
- •Both modalities demonstrated good to excellent sensitivity and specificity for detecting artificially created soft tissue lesions in the DFTS
- •CTT may be a viable alternative to MRI for diagnosing MF tears specifically