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===Description===
===Description===
Impaction of the large colon is seen in horses with limited access to drinking water or grazing bare pastures. The sand is not ingested but accumulates within the right dorsal colon, pelvic flexure and transverse colon. Due to its high density, the sand forms a sediment within the colon
Impaction of the large colon is seen in horses with limited access to drinking water or grazing bare pastures. The sand is not ingested but accumulates within the right dorsal colon, pelvic flexure and transverse colon. Due to its high density, the sand forms a sediment within the colon. This type of colic is particularly common in dry sandy regions of the world and is far less common in the UK and rest of Europe.
===Clinical signs===
===Clinical signs===
Bulk laxatives such as Psyllium are used to assist in the movement of sand. Psyllium is administered directly into the stomach via a nasogastric tube and the sand become incorporated into the laxative. This treament is continued for up to a week until all sand is fully removed from the colon.
Bulk laxatives such as Psyllium are used to assist in the movement of sand. Psyllium is administered directly into the stomach via a nasogastric tube and the sand become incorporated into the laxative. This treament is continued for up to a week until all sand is fully removed from the colon.
If the impaction is large or non-responsive to medical treatment, surgery may be indicated.
===Prognosis===
===Prognosis===
For cases that are not resolved by conservative treatment, the prognosis is good if surgery is performed early.
===References===
===References===
Mezerova, J., Kabes, R., Zert, Z., Jahn, P., Hanak, J. (2001) '''Impaction of right dorsal colon in the horse: report of 32 cases''' ''Vet. Med. - Czech, 46(11-12): 293-300''
Mezerova, J., Kabes, R., Zert, Z., Jahn, P., Hanak, J. (2001) '''Impaction of right dorsal colon in the horse: report of 32 cases''' ''Vet. Med. - Czech, 46(11-12): 293-300''