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Anatomical location and case history and progression supported a dacryolith. Following removal, the calculus was submitted for mineralogic analysis. The calculus was primarily carbonate hydroxylapatite (Ca<jats:sub>10<\/jats:sub>(PO<jats:sub>4<\/jats:sub>)<jats:sub>3<\/jats:sub>(CO<jats:sub>3<\/jats:sub>)<jats:sub>3<\/jats:sub>(OH)<jats:sub>2<\/jats:sub>) with a minor NaCl halite constituent. Dacryoliths, or nasolacrimal calculi, are an uncommon occurrence in animals, and sparsely reported in humans. The etiopathogenesis of dacryolith formation is unknown. The objective of this article was to report the first case report of an equine nasolacrimal system dacryolith and its mineralogic composition.<\/jats:p>","DOI":"10.1111\/j.1463-5224.2006.00454.x","type":"journal-article","created":{"date-parts":[[2006,4,11]],"date-time":"2006-04-11T20:21:19Z","timestamp":1144786879000},"page":"187-190","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Calcification associated with the nasolacrimal system of a horse: case report and mineralogic composition"],"prefix":"10.1111","volume":"9","author":[{"given":"Nicholas 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