Enteroliths are mineralized concretions of magnesium ammonium phosphate (struvite) that form in the right dorsal colon of the horse. The enteroliths typically form in a concentric pattern around a central nidus such as a silicone stone. Small enteroliths may pass through the gastrointestinal tract unnoticed
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===Signalment===
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All horses may be affected by enterolithiasis but certain breeds are predisposed including Arabians, Morgans and Miniature horses. Females are more likely to develop enteroliths than males.