Magnetic resonance imaging following regional limb perfusion of gadolinium contrast medium in 26 horses.
Authors: Aarsvold S, Solano M, Garcia-Lopez J
Journal: Equine veterinary journal
Summary
# Editorial Summary: Regional Limb Perfusion for Contrast-Enhanced MRI in Horses Regional limb perfusion offers a practical alternative to systemic gadolinium administration for enhancing MRI images of the equine distal limb, circumventing the prohibitive contrast volumes required for whole-body imaging. Aarsvold and colleagues administered just 5 mL of gadopentetate dimeglumine via a palmar or plantar digital vein with tourniquet occlusion in 26 horses, demonstrating that 25 of 26 limbs achieved adequate contrast enhancement with no adverse reactions reported. Of 132 lesions identified across the cohort, 69 enhanced with contrast, whilst 12 lesions were only visible post-contrast—a clinically significant finding suggesting that precontrast imaging alone may miss pathology, particularly adhesions, deep digital flexor tendinopathy, and neovascularisation. The technique's feasibility and safety profile make it a valuable diagnostic tool for practitioners seeking to improve soft tissue characterisation in equine distal limb investigations, though tourniquet placement integrity proved critical to success. Whilst the study's small case numbers and heterogeneous lesion types precluded statistical analysis, the descriptive enhancement patterns established here provide a useful reference for interpreting contrast-enhanced images in clinical practice.
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Practical Takeaways
- •Regional limb perfusion offers a practical alternative to systemic gadolinium administration, requiring only 10 mL total contrast volume versus much larger systemic doses in horses
- •This technique can reveal additional lesions not visible on pre-contrast images, potentially improving diagnostic accuracy for distal limb pathology
- •The method is safe with no reported adverse reactions, making it a low-risk addition to standard MRI protocols for lameness investigations
Key Findings
- •Regional limb perfusion with 5 mL gadopentetate dimeglumine successfully enhanced MRI contrast in 25 of 26 horses (96% success rate)
- •69 of 132 detected lesions demonstrated contrast enhancement, with 12 lesions identified exclusively after contrast administration
- •No adverse reactions were observed in any horse receiving regional contrast perfusion
- •Contrast enhancement aided characterization of lesions including adhesions, deep digital flexor tendinopathy, and identification of neovascularisation