MSD Manual

Please confirm that you are a health care professional

honeypot link
Professional Version

Enostosis-like Lesions of the Third Metatarsal Bone in Horses


Jane C. Boswell

, MA, VetMB, CertVA, CertES (Orth), DECVS, MRCVS

Last full review/revision Sep 2015 | Content last modified Jun 2016

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.

quiz link

Test your knowledge

Take a Quiz!