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Enostosis-like Lesions of the Third Metatarsal Bone in Horses

By Jane C. Boswell, MA, VetMB, CertVA, CertES (Orth), DECVS, MRCVS, The Liphook Equine Hospital ; James K. Belknap, DVM, PhD, DACVS, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Ohio State University ; Tracy A. Turner, DVM, MS, Anoka Equine Veterinary Services ; Peter Clegg, MA, Vet MB, DipECVS, PhD, MRCVS, Veterinary Teaching Hospital, School of Veterinary Sciences, University of Liverpool ; Matthew T. Brokken, DVM, The Ohio State University ; Marcus J. Head, BVetMed, Rossdales Equine Hospital and Diagnostic Centre ; James Schumacher, DVM, MS, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee ; John Schumacher, DVM, MS, Department of Clinical Sciences, College of Veterinary Medicine, Auburn University ; Chris Whitton, BVSc, FANZCVS, PhD, Equine Centre, University of Melbourne

Enostosis-like lesions of the third metatarsal bone appear as intense focal areas of increased uptake of radionuclide on scintigraphic examination after injection of 99mTc–labelled methylene diphosphonate. Radiologically, they appear as round or irregularly shaped areas of increased radiopacity within the medullary cavity. They are usually asymptomatic and rarely cause lameness. Lameness, if present, usually improves with rest and administration of NSAIDs.