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Diffuse inflammation may be the only lesion observed in foals with early GDUD.<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>  In contrast to other scoring systems,<ref>MacAllister, C.G, Andrews F.M, Deegan E, Ruoff, W, Olovson, S.G (1997) A scoring system for gastric ulcers in horses.  ''Equine Vet J'', 29:430-433.</ref> the EGUC approach does not include bleeding when assigning lesion grades.  The justification is that the 'snapshot' provided by endoscopy may by chance identify bleeding of superficial erosions whilst missing the intermittent haemorrhage of more severe lesions. <ref name="EGUC">The Equine Gastric Ulcer Council (1999) Tutorial Article: Recommendations for the diagnosis and treatment of equine gastric ulcer syndrome (EGUS).  ''Equine Vet Educ'', 11(5):262-272.</ref> Endoscopy may assist in understanding the severity of the disease and assessing the therapeutic response, but it is not without disadvantages.  Ulcer severity may be underestimated, particularly in the squamous region and glandular ulcers may be missed altogether.<ref>Andrews, F.M, Reinmeyers, C.R, McCracken, M.D, Blackford, J.T, Nadeau, J.A, Saabye, L, Sotell, M, Saxton, A (2002) Comparison of endoscopic, necropsy and histology scoring of equine gastric ulcers.  ''Equine Vet J'',34(5):475-478.</ref>  Lesions that appear grossly similar may have different grades on histopathology.<ref name="Nadeau">Nadeau, J.A, Andrews, F.M (2009) ''Science: Overviews'' Equine gastric ulcer syndrome: The continuing conundrum.  ''Equine Vet J'', 41(7):611-615.</ref>  This is important as varying lesions may have different causes, requiring a range of treatment approaches.

Diffuse inflammation may be the only lesion observed in foals with early GDUD.<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>  In contrast to other scoring systems,<ref>MacAllister, C.G, Andrews F.M, Deegan E, Ruoff, W, Olovson, S.G (1997) A scoring system for gastric ulcers in horses.  ''Equine Vet J'', 29:430-433.</ref> the EGUC approach does not include bleeding when assigning lesion grades.  The justification is that the 'snapshot' provided by endoscopy may by chance identify bleeding of superficial erosions whilst missing the intermittent haemorrhage of more severe lesions.<ref name="EGUC">The Equine Gastric Ulcer Council (1999) Tutorial Article: Recommendations for the diagnosis and treatment of equine gastric ulcer syndrome (EGUS).  ''Equine Vet Educ'', 11(5):262-272.</ref> Endoscopy may assist in understanding the severity of the disease and assessing the therapeutic response, but it is not without disadvantages.  Ulcer severity may be underestimated, particularly in the squamous region and glandular ulcers may be missed altogether.<ref>Andrews, F.M, Reinmeyers, C.R, McCracken, M.D, Blackford, J.T, Nadeau, J.A, Saabye, L, Sotell, M, Saxton, A (2002) Comparison of endoscopic, necropsy and histology scoring of equine gastric ulcers.  ''Equine Vet J'',34(5):475-478.</ref>  Lesions that appear grossly similar may have different grades on histopathology.<ref name="Nadeau">Nadeau, J.A, Andrews, F.M (2009) ''Science: Overviews'' Equine gastric ulcer syndrome: The continuing conundrum.  ''Equine Vet J'', 41(7):611-615.</ref>  This is important because varying lesions may have different causes, requiring a range of treatment approaches.

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