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*'''Endoscopy''' would be indicated in a chronic case(Mair, Blisk) and may show a full stomach after a fast of 18-24hrs.<ref name="Sanchez">Sanchez, L.C (2010) 'Diseases Of The Stomach' in Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Saunders, Chapter 15.</ref> However it is not diagnostic for impaction as it is difficult to assess gastric distension by endoscopy.<ref name="Mair">Mair, T.S, Divers, T.J, Ducharme, N.G (2002) '''Manual of Equine Gastroenterology''', ''WB Saunders''.</ref>
*'''Endoscopy''' would be indicated in a chronic case(Mair, Blisk) and may show a full stomach after a fast of 18-24hrs.<ref name="Sanchez">Sanchez, L.C (2010) 'Diseases Of The Stomach' in Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Saunders, Chapter 15.</ref> However it is not diagnostic for impaction as it is difficult to assess gastric distension by endoscopy.<ref name="Mair">Mair, T.S, Divers, T.J, Ducharme, N.G (2002) '''Manual of Equine Gastroenterology''', ''WB Saunders''.</ref>
*In a small horse or pony, a lateral '''radiograph''' of the cranial abdomen may show the diaphragm displaced cranially
*In a small horse or pony, a lateral '''radiograph''' of the cranial abdomen may show the diaphragm displaced cranially
*[[Colic Diagnosis - Abdominal Ultrasound|'''Ultrasonography''']] may reveal a markedly enlarged gastric echo extending over six or more intercostal spaces on the left side of the abdomen. A marked increase in the thickness of the wall of the stomach may also be imaged.<ref>Edwards, G.B (2003) 'Gastric Pathology' in Chuit, P, Kuffer, A, Montavon, S (2003) ''Congress on Equine Medicine and Surgery'', International Veterinary Information Service (www.ivis.org), Ithaca, New York, USA.</ref>
*[[Colic Diagnosis - Abdominal Ultrasound|'''Ultrasonography''']] may reveal a markedly enlarged gastric echo extending over six or more intercostal spaces on the left side of the abdomen. A marked increase in the thickness of the wall of the stomach may also be imaged.<ref name="Edwards">Edwards, G.B (2003) 'Gastric Pathology' in Chuit, P, Kuffer, A, Montavon, S (2003) ''Congress on Equine Medicine and Surgery'', International Veterinary Information Service (www.ivis.org), Ithaca, New York, USA.</ref>
'''However, if the horse suffers from acute severe colic, a diagnosis is often made at surgery'''.
'''However, if the horse suffers from acute severe colic, a diagnosis is often made at surgery'''.